Back in 1998, me and a buddy had just completed our open water certification in Akumel, Mexico, we were with another buddy who was an experienced diver. The house we were staying in was right on the beach so we got fresh tanks and lights after dinner and decided to head out when it was dark. It wasn't a deep dive because the reef was right off shore, but it was a long dive. We saw so much stuff that night including turtles, sharks, eels, rays and a very friendly octopus. I still have that light it goes on every trip with me.