Mile Marker 4

Kailua-Kona, Big Island, HI
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Entry Map
directions
Directions
photos
Photos
Difficulty
beginner
Viz (last reported 66576h ago)
Max Depth
40ft (unconfirmed)

Snorkeling and Scuba Diving at Mile Marker 4

Mile Marker 4 is small beach with easy entry. Several lava tubes may be found a short swim to the left. Directions: Mile Marker 4 is, as the name implies, found right at the 4 mile marker of Ali'i Drive just south of Kailua.
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Mile Marker 4 Tide Chart and Surf Report (Beta)

Thursday
1:21 AM / 1.676ft
Thursday
7:29 AM / -0.013ft
Thursday
2:10 PM / 2.062ft
Thursday
8:19 PM / 0.442ft
Friday
1:45 AM / 1.539ft

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Kona Shore Divers - Our goal is to give you the opportunity to share and explore the underwater world in and around the near shore waters of Kailua-Kona. We focus on small group sizes and strive to offer the best personalized service we can to our guests. From the first timer to the old timer come with us and see what the Kona Shore has to offer! Book Now
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Zentacle
Zentacle
Sep 21, 2021, 1:05 AM
scuba
The dive entry is just to the right, and the sights will be found to the left. Pick a calm day to do this dive, as the water can become cloudy from the adjacent beach.
Ann Geiger
Ann Geiger
Mar 18, 2014, 12:00 AM
scuba
This is a local favorite, because it is an easy dive with a large variety of fish. We saw many different kinds of butterflyfish, as well as tangs, surgeonfish, hawkfish, triggerfish, damselfish. Several moray eels and a crab. Minor coral bleaching but reef looks healthy overall. Saw two other dive buddy pairs. To the left (south) in about 25 feet of water there is a small lava tube that you can easily swim through and then either turn around or pop up in 10ish feet of water. We swam out to the edge of the reef then swam along the sand edge for a ways, turning around at a pinnacle (hit our max depth of 50' there). Swam back in at around 25' (checked out the lava tube). The dive site itself is at mile marker 4 but the entry to the parking area is between 3 1/2 and 4, just past a small sandy beach. Park at the far end of the lot (we were able to get one of the last spots around 10:15 am). Gear up at your car, then walk through the small opening in the wall and down the path to the lava rock beach. Toward the middle of the beach there is a small sandy channel that makes entry and exit easier. Walk out past the surf zone, don your fins, and away you go!
Originally posted on shorediving.com
Jayne
Jayne
Feb 17, 2014, 12:00 AM
scuba
I've snorkeled here multiple times and dove here recently. I've never had a great experience. The reef and animal life are great but getting to them is horrid. The rock entry makes hauling gear tough, the surf is unpredictable. I'm a new diver. I was in a group of 5 divers, only TWO came out not bleeding and cut up or not needing stitches. Personally, I lost a booty, a fin, a snorkel and cracked my mask on the rocks. Despite the wicked surf getting in and out...if you're experienced this is an awesome dive! Lots of beautiful things to see, lots of fish. There is an arch if you go out past the sand patch. Good luck, wear booties and gloves, watch for sea urchins and waves.
Originally posted on shorediving.com
Mike from Honolulu
Mike from Honolulu
Jun 29, 2013, 12:00 AM
scuba
Easy access by car, short walk over loose rocks for entry with a slight hill. Parking is limited there is no sandy area. There is an arch but is it shallow and we missed it-- one of the people we were with that was snorkeling with saw it-- there is a decent lava tube.
Originally posted on shorediving.com
Kelly 1
Kelly 1
Sep 26, 2012, 12:00 AM
scuba
This was our 3rd dive for the day. We weren't sure we would find the lava tubes on our first outing, but we found them fairly easily. We snorkeled out about 1/3 of the way out of the bay and then dropped down - it was only about 10' for us - and then kept going out with a slight angle to the left. We went up and down several of the fingers of the lava tubes and finally found the ones with the arch swim through and the tunnel that ended with a chimney opening. We looked up and could see that the surge was pretty heavy at the time, so we opted not to go up and instead went back out the way we came in. We most likely would have had better vis had we come earlier in the day, but we wanted to do 2-step/Place of Refuge in the morning since we heard that place gets packed - glad we did because we had the 1st dive to ourselves. But about 4 Mile - it's a fun, short dive with not much sea life for us, though I know a shark can sometimes hide out in that tunnel. I read the info here and was planning to park on the street as the photos indicated but found the parking lot just to the north to be easier and closer to the 'sandy' entry (note, the sandy entry area is small but definitely doable). The rocks near the entry were large enough to set our BCDs/tanks and sit down to get everything fastened after getting our mask defogged. My buddy and I are both Intermediate Divers with 20-30 dives and enjoyed this dive as a variation from our other 2 shore dives at Place of Refuge.
Originally posted on shorediving.com
Tracy RIdeout
Tracy RIdeout
Sep 15, 2012, 12:00 AM
scuba
Very nice dive, easy access from the little rocky beach. short swim out into the cove and drop down to 20'. We followed the reef system out to the sandy bottom at about 35' and looked around the reef system for about 35 minutes, then swam south to the lava tubes and arch swim through. That was pretty cool. We saw a big hawksbill turtle sleeping on the bottom a spotted moray and lots of fish. I was looking for the reef trigger, but didn't find one. All in all, a very nice shore dive and lots of fish. Swim throughs were fun and the lava tube was pretty cool. Went through the cave and up through the little sky light. Easy swim back. There's a shower at the beach to the north, but we didn't use it.
Originally posted on shorediving.com
Samantha
Samantha
Nov 26, 2011, 12:00 AM
scuba
Pretty great dive. Very easy in. The out on the second dive was a bit tougher due to surge, but nothing insurmountable or dangerous. Saw a nice sleeping turtle in the back of a pretty cool and easy to navigate cave. Will likely go back here before we leave the island. One beginner diver and one advanced diver and we both had fun.
Originally posted on shorediving.com
Cranbrook Dave
Cranbrook Dave
Jul 30, 2011, 12:00 AM
scuba
First time diving this site. Early start for easy entry, great visibility (70+ ft) and lots to see. Great diversity of fish, porcupine puffers, razor, triggers to name a few. A few snorkelers. Dive/snorkel boats stopped near by to see dolphins, we could hear but not see the dolphins. Lots of features to engage all levels of divers. Capped off by an inquisitive green turtle. Best dive this trip, We will return.
Originally posted on shorediving.com
Paul D.
Paul D.
Apr 16, 2011, 12:00 AM
scuba
This was our second dive of the day. I must say what a bummer that we had such big expectations for this dive. We set ourselves for failure by forgetting that mother nature is still in charge. The surge was heavy. Our buddy, upon entry got pummeled and not realizing lost half of his weights. The sandy bottom had things too kicked up, so vis was poor. We did manage to see an eagle ray, before buddy called the dive because he was not able to stay down before he realized that his weights were missing. There is always next time. Aloha.
Originally posted on shorediving.com
Nate
Nate
Sep 26, 2010, 12:00 AM
scuba
The reviews below are true. The shark cave off to the left is great. The opening is a coral canyon that steepens into an overhang that frames the entrance in 30' depth. The first tunnel is about 20' long (10' wide) and empties into a sunlit chamber. The second tunnel is shorter but MUCH narrower (5' wide) and empties into a smaller sunlit chamber but NO SHARK today. :-( Remainder of dive was GREAT. The amount of invertebrate life is amazing. Crown of Thorns Starfish, Helmut Shell Conches, Tuxedo Urchins galore and too many fish types to name.
Originally posted on shorediving.com
Jerry & LaRea Birt
Jerry & LaRea Birt
Sep 21, 2010, 12:00 AM
scuba
We dove this site early in the morning, which was a good thing, as the parking lot filled up. The entry was a little difficult on account on the swells. But this is a very good dive. The lava tube is well worth the effort. We saw a turtle on our way out, and the Horned Helmet Shells out in the sand were an interesting find.
Originally posted on shorediving.com
Mike Groves
Mike Groves
Aug 6, 2010, 12:00 AM
scuba
Just a quick update as it has not been evaluated in the past few years. Really nothing has changed. Saw 2 turtles, one on our way out and one coming in. Also saw a very active eel just outside cove, which surprised me as it was 10am. The lava tube was a highlight and reason enough to make this dive. I will do this one again when we return.
Originally posted on shorediving.com
Bugaball
Bugaball
Nov 8, 2008, 12:00 AM
scuba
Great place, easy access. There is a nice cave off to the left of the cove, where we were told sometimes there is a reef shark in the cave in the morning- didn't see it. The cave is a safe and easy entry/exit. Easy navigation, nice reef, easy water entry and exit. Some snorkelers when we took of, and two other divers. Good fun.
Originally posted on shorediving.com
Brian Xavier
Brian Xavier
Dec 21, 2007, 12:00 AM
scuba
Great dive. Easy entry with great vis. Park in the lot next to the cove and go through the rocky surf straight out into the cove. Dove to 40 feet and very nice dive. No people around except a few snorkelers.
Originally posted on shorediving.com
Sarah Kneisel
Sarah Kneisel
Dec 18, 2007, 12:00 AM
scuba
We dove this sight a couple times during really high surf. Entry was no problem as we could wait for a period of low surf but I got really banged up upon exit (bruises - no blood). The rough surf contributed to poor visibility, but I could tell it would have been a great site during low surf. There are great caverns and little caves. We saw a few morays and lots of fish. Definitely worth trying when the conditions are right.
Originally posted on shorediving.com
Anonymous
Anonymous
Aug 15, 2007, 12:00 AM
scuba
Entry a little tricky, so just go slow. Nice cave off to left with sleeping turtles and other creatures in little crevices. After looking at the cave, you can follow the reef to the left or swim straight out over the sand to a second reef.
Originally posted on shorediving.com
Steve Porter
Steve Porter
Aug 12, 2007, 12:00 AM
scuba
This was the last dive I got to do with my father when he was visiting in Feb 2006 (he passed away on 06-04-07 and will be missed). It was a super duper easy entry, navigation was a snap, and heard whales…and they were close. Vis was about 80 ft due to that 40 days of rain we'll never forget. Saw a manta ray, and LOTS of crabs!!!! Not too sure if they are protected in this area. If you don't do this one while on the Big Island, you're robbing yourself!
Originally posted on shorediving.com
Maria
Maria
Jul 1, 2007, 12:00 AM
scuba
Dove here on 6.27.2007. What can I say… THE BEST shore dive I ever had, and very few boat dives I have had can beat it! Great everything: access, entry, visibility, coral, underwater relief. There was a very curious dwarf moray :), brittle stars, octocoral and nudibranches in the lava tubes to the left! Turtles! Also saw a lagoon triggerfish (humuhumu-like but with bright blue stripes) for the first time. Had to face an offshore current on the way back but not too bad. There is an extremely convenient place to gear up right where the guard rail and trail head meet (someone installed a kind of shelf there :)
Originally posted on shorediving.com
Pam O
Pam O
Jun 9, 2006, 12:00 AM
scuba
Great dive if staying in Kailua-Kona. Good parking on either side. There are shower facilities for after the dive. Short walk down to the entry, rocky but easy to navigate to the water. Easy in and short snorkel. Nice reefs, caves, and lava tubes. Abundant fish life. Locals in the area say there are three caves with sharks and guarding them, but we did not find the sharks.
Originally posted on shorediving.com
Scooter Schneider
Scooter Schneider
Jun 1, 2006, 12:00 AM
scuba
This was my first dive at Mile Marker 4. There was a good surge and wave action and, although I had no problem, the wife was getting beat up a little. Once in, it's a wonderful dive with lots of swim throughs and caverns after you go around the point to the left. We saw several Lizardfish and turtles. Viz was a bit poor until we went around the point to deeper water and then it was good. There were surfers to the right and I thought it might be fun to grab an ankle. Next time ;)
Originally posted on shorediving.com
Chad Gordon
Chad Gordon
Dec 15, 2005, 12:00 AM
scuba
Nice dive with easy shore entry. Had fun with 2 eagle rays and saw numerous turtles. Good dive to do as a second one in a day. Head out to the left and there are plenty of lava tubes to swim through.
Originally posted on shorediving.com
Joanne Evans
Joanne Evans
Aug 17, 2005, 12:00 AM
scuba
This was our last dive on the Big Island before we had to come home. What a way to end our vacation! This was a great dive with the lava tubes and the turtles and fish. But I did not like the entry as it was very rocky and I was nervous about all the black Sea Urchins. There is parking on the right hand side (free) right next to the beach.
Originally posted on shorediving.com
Bill Benton
Bill Benton
Aug 21, 2004, 12:00 AM
scuba
Nice easy dive, short walk from parking. Good area for multiple dives. Best in the morning.
Originally posted on shorediving.com
Rick Inman
Rick Inman
Mar 19, 2004, 12:00 AM
scuba
There is a nice lava tube swim through here, some interesting structure and a few pukas, and the location makes this a quick easy dive if you're staying in town, but otherwise I would drive to better sites. I wanted to make a night dive here, but never got to. I lost my knife here rolling in on the rocks, so if you found it, enjoy!
Originally posted on shorediving.com
Chuck Knauf
Chuck Knauf
Mar 19, 2004, 12:00 AM
scuba
I always dive this site while visiting Kona. Nothing to add to the other reviews. HOWEVER...Between Nov. '03 and Mar. '04, the handy wall to gear up on has grown. Land owner next to the site raised the gear-up wall to about 5 or 6 feet. We have to gear up the hard way now. *sigh*
Originally posted on shorediving.com
Mark Wilson
Mark Wilson
Nov 17, 2003, 12:00 AM
scuba
Great site. It was our first dive in Hawaii. The Lava Tube was interesting with plenty of life. The surge however was a bit tiring. Overall, This was a very easy place for beginners.
Originally posted on shorediving.com
Eric Crawford
Eric Crawford
Sep 25, 2003, 12:00 AM
scuba
This is great site, especially if staying in Kona. The parking, entry, and surface swim is a breeze. The dive is definitely a shallower one, with max depth of about 35 feet. The lava tube/s we found were great with a couple turtles feasting in the back of them. There is great coral growth with lots of fish and easy navigation. I would really recommend doing this dive once during the day then again at night. I think the coral formations and the easy access would make for a great night dive.
Originally posted on shorediving.com
Barry Fackler
Barry Fackler
Jan 22, 2003, 12:00 AM
scuba
A great dive site in the summer but a hit-or-miss proposition in the winter when NW swells drive the surf right into this little cove. In Summer 2002, a parking lot was added just north of this site by the county. You can gear up in this lot and walk down a narrow path to the entry. This is nice because parking is limited along the wall on Ali'i Drive. An added bonus is the shower & toilets @ the north end of the lot (for adjacent Magic Sands Beach Park). Once in the water, the best variety of terrain is to the left (south). There is a series of lava tubes, canyons, and caverns in this direction. Outstanding variety of tropical reef fish here. Saw 6 Green Sea Turtles on a single dive in this area. Lots of Whitemouth, Undulated, & Yellowmargin Morays. You can stay shallow & explore the reef tops or go 40 to 60' and check out the canyons. In a couple of caverns you can see uncommon Wavy Cave Sponges on the wall. This is a good place to find mollusks like Tiger Cowries, Leopard Cones, Triton's Trumpets & Day Octopi. Heading straight out can also be a good dive. In the shallows you can spot Lagoon Triggerfish and Dragon Wrasse. In around 20', my wife & I once saw 2 White-tip Reef Sharks tucked under a ledge. Further out, on the sand flats I've seen big Horned Helmet shells, Kona Crabs, and Blackside Razorfish that dive headfirst into the sand when you approach. Bluefin Trevally patrol out here also. The sand flats are also home to a couple colonies of Antler Coral each standing around 3 feet above the otherwise featureless terrain. When exiting the water, it's best to wait for any sets to pass. The bottom is really rocky and uneven and just a relatively small wave can knock you over. Likewise, the path that leads up to Ali'i Drive is strewn with loose coral rock that can easily make you lose your footing.
Originally posted on shorediving.com
Kim
Kim
Aug 6, 2002, 12:00 AM
scuba
This is a great spot - always stay in Kona, so its a convenient place to dive. Did a night dive here this trip - very cool! Saw a very large crab, many smaller crab, shrimp everywhere, slipper lobster - the differences between day and night are amazing.
Originally posted on shorediving.com
Bill Stohler
Bill Stohler
Aug 4, 2002, 12:00 AM
scuba
When the surf's down, this is a pretty easy and nice dive. It's just 5 minutes South of Kona town, and there are a few parking spots along the guard rail. The beach is comprised of well-rounded rocks, so watch your footing. On my second time there, we were out swimming out over the sand flats in about 60 feet, and saw a manta ray resting on the bottom. Good reef, and topography. Good beginner to intermediate diving, or if you just want something close to town.
Originally posted on shorediving.com
Mike Dinmore
Mike Dinmore
Jul 18, 2002, 12:00 AM
scuba
I enjoy this site. Good site for the novice and intermediate diver. Nothing advanced about the area, so don't pack your twin 80's. Beautiful cave out and to the left of the bay. Keep your eyes open for blackside razor fish while in the sand patches.
Originally posted on shorediving.com
Jon Knight
Jon Knight
Apr 17, 2002, 12:00 AM
scuba
This is a great stand-by site. Be careful of the entry and exit. Take your time. Very nice cave to the left and some surprising activity straight out from shore on small coral beds at 40'. I've found some interesting things out there. Haven't dove here at night yet, but I've heard it's good. With a chance of coming face to face with the caves evening resident.
Originally posted on shorediving.com
Jim Goodenough
Jim Goodenough
Sep 10, 2001, 12:00 AM
scuba
I love this dive. The wall along the road is the perfect height to rest your tank when gearing up. The entry is tough since there are waves and slippery rocks. Love the lava tubes and turtles.
Originally posted on shorediving.com
Nydia White
Nydia White
Jul 16, 2001, 12:00 AM
scuba
Fairly easy site. Watch the wave action. The entry/exit is challenging if the surf is up. The site is pretty shallow for quite a while and if there is a lot of surge you need to be careful about getting "high-sided". Very convenient area with the wall along the road to gear up. Easy access from the road to the shoreline. This site has a lot to offer and you will not see everything in one dive. I loved the channels and exploring down each one. This dive can easily be done while staying relatively shallow. Good for any experience level. Watch your air...it's easy to get pretty far away from the entry without realizing it. Save enough air to get all the way back.
Originally posted on shorediving.com
Roger Johnson
Roger Johnson
Jun 3, 2001, 12:00 AM
scuba
Having done at least 500 dives at this site in the past 20 years, I have to say it's getting better with age. Manta's, Eagle Rays, Octopus, lots of Green Sea Turtles. Night dives with White Tips guarding the opening of the lava tube, what a thrill! Take a u/w scooter and see a beautiful reef at 80 ft. It's loaded with fish.
Originally posted on shorediving.com