I was looking back in my log book and came across a fun trip - thought you might get a laugh from it.
Diving off NW coast of Costa Rica in 70 feet. Site is called Virador - cool rock that you swim around. Water was murky - viz. about 30 feet or so. I was just below the group of 6 divers - scouting along where sand met the rocks. The group spooked a lot of fish towards me - not sure what kind.
I saw something out of place on the sandy bottom - anchor hound in me always looking for stuff. This object was about 4 feet long and at a 90* angle. Looked like a cross or X on the bottom. I got closer and went to pull the treasure from the sand.
Just as I reached for it - bottom exploded and some thing big brushed past me. Turns out - it was two large Rays laying buried in the sand.
The X I saw was their long tails laying over one another. Pure luck I did not get hurt by these big 4-5 foot Rays.