The Tunnel is located about 200 yards north of Double Reef. It's really just a long undercut below an upper reef layer that you can swim through. You can enter it from the top of the reef, or from what most divers use as the exit at the sand flats that are adjacent to the reef.
The surrounding sand flats are home to garden eels, small nudibranches, and many small "mini" reefs that most divers overlook. This is a very easy dive, but take care and don't kick with wide strokes when going through the tunnel. The divers behind you will thank you.
Garden Eels are one of the most timid creatures in the oceans. They range in size from 8 to 27 inches tall, are usually light gray/brown in color and live in sand flats that receive a good current.
When you see one, there are many more. These colonies feed on plankton and are extremely shy creatures. When they sleep, these tiny eels bury themselves in the sand.
The only time they leave their lairs is to mate and when they are in extreme danger. Trying to get a good close up picture of these eels will test your patience! If you make the mistake of approaching them from above they'll quickly disappear into the sand. Stay very low and move slowly. Good luck.