Dive Plans for layout of Datura Avenue Dive
Site and Shipwreck Snorkel Trail
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Gearing UpCarry your cylinders and gear past the shady pavilion to the two-foot
seawall. Assemble your SCUBA unit. Set your fins, flags, and extra stuff right next to your rig. After you've
tested and set up your gear, put on your wetsuit. You might wish to take a quick shower to remain cool. Then
proceed to water's edge.
Average Conditions
- Depth 18 ft on sand, 12 ft on top of the reef
- 25 ft of visibility (Usually morning is best)
- Water Temperature 72°F winter, 84°F summer
- 1-2 foot waves
- Slight North current at bottom (.25 knots)
- Surface current from same direction as wind
- Light surge (consistent with wave size)
To determine today's conditions:
- Look at the people floating in the water. Which way are they moving? That's the surface current.
- When you swim by the buoy, look at the rope. If it's straight, there is current. If it is dangling and
bouncing, then it's just the waves.
- When you descend on the snorkel trail, stop and hover next to a stationary object. If you are moving,
that's current. If you are swaying side-to-side, that's surge.
Remain mindful of condition changes.
Returning to ShoreWalk up the beach and sit down on the wall next to the shower.
Rinse your gear while breaking it down. Please share the shower with beach goers. Get ready for questions! "Did
you see any sharks?" "What did you see out there?" "Is there anything out there?" " How many lobsters did you
catch?" Now that you're there, enjoy the day. There are plenty of shops and restaurants on the corner of
Commercial and El Mar Drive.
Most of the content for this article was contributed by Matthew Hoelscher. Matt and Andrea conduct monthly fish surveys off Datura Avenue.

Photos © Copyright 2004 by Matthew Hoelscher.
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| A: Out and Back South (Novice Dive) |
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Swim out on your back 10 feet past the buoy. You should see the Shipwreck
Snorkel Trail below you. Descend and swim due East. You will see the hard bottom for 75 feet, an area that
looks like "Swiss Cheese" for 50 feet, and then patch areas for 25 feet. That is the first reef line. Then
you cross 75 feet of pure sand. The sand will turn into rubble and shells as you get closer. Then the
second reef line will appear. Hard corals the size of garbage cans will be in front of you. Note your
pressure and the time it took you to swim out there! Add 400 psi to that amount for safety and subtract it
from the gas you have left. Take half the remaining gas to swim South along the edge of the reef.
Typically, a North current makes your swim home easier. When you reach your turn pressure, head back
North.
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When you reach the "Alien Probe," a four-foot-long concrete cylinder along the reef's edge,
head West back to the snorkel trail. Begin your easy underwater swim for shore from the first reef line and
with about 1000 psi. Depending on how the dive goes, feel free to use some of the reserve gas to enjoy the
dive. As with all diving, plan to surface with at least 300 psi in your cylinder. |
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| B: Out and Back North (Intermediate Dive) |
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Start the same as for Plan "A." Swim out on your back 10 feet past the buoy.
You should see the Shipwreck Snorkel Trail below you. Descend and swim due East. You will see the hard
bottom for 75 feet, an area that looks like "Swiss Cheese" for 50 feet, and then patch areas for 25 feet.
That is the first reef line. Then you cross 75 feet of pure sand. The sand will turn into rubble and shells
as you get closer. Then the second reef line will appear. |
| Hard corals the size of garbage cans will be in front of you. Note your
pressure and the time it took you to swim out there! Add 400 psi to that amount for safety and subtract it
from the gas you have left. Take half the remaining gas to swim North along the edge of the reef. Remember,
you are probably going WITH the current, so your swim home will require more gas and time. Generally
reserve an extra five minutes or 200 psi. The North route has much bigger and denser hard coral
populations. There are also more fish as you pass the pier. Again, if you follow the edge, you will hit the
"Alien Probe" and turn West to head in. |
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| C: 1st and 2nd Reef Combo (Advanced Dive) |
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Swim out on your back 10 feet past the buoy. You should see the Shipwreck
Snorkel Trail below you. Descend and swim to the South group of three cannons. From there, take a
heading of 150 degrees (SE) across the first reef line until you reach the "Swiss Cheese" then turn South
and follow that edge. You should hit a large group of four coral colonies that have grown together.
Continue South for 1000 psi or 25 minutes. Then turn East and swim across the rest of the first reef and
the sand to the second reef edge. |
| If you make it a block South, you will find an excellent section of hard
coral. Now turn North and ride the current while you explore the second reef line edge. There is a second
"Alien Probe." You can distinguish between the two as the Southern one has soft corals and sea fans growing
on top of it. It is very decorated. It's a nice easy 20-minute swim between the two probes. You will pass
several car tires embedded in the reef along the way. Once you reach the second probe, turn West and head
back in to Datura Avenue. Your first time, you might want to keep the dive to an hour, swimming 20-minute
legs. As you get better at estimating your gas consumption, you can expand the dive to cover more
ground. |
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