My first night dive was in the Red Sea directly after my OWD cert at the beginning of May this year. There was a half-moon which made torches almost unnecessary, and indeed almost a pain, with the lionfish flocking around them like moths to a streetlamp.....
The DARKEST dive however, was yesterday at noon in the murky cold waters of Lake Constance. It was my 15th overall dive, so I was a bit nervous.
At 27 meters, it was almost pitchdark, and the water temp was around 7C. It was all quite exciting, because I had never been that deep before, never that dark, never that cold, and had never gotten my tank valve caught in an obstruction in the wall of the drop-off. I managed to free myself, and then turned the lamp onto whatever it was that I had been hung-up on: to my wonder, there is a small shelf mounted into the stone at 27 meters, with a telephone on it, and some porno magazines sealed into plastic!
I nearly choked myself laughing!
After we ascended, the instructor who was with me was laughing so hard he could barely inflate his BCD- he of course knew about the phone down there all along.....
It was at noon, but seeing as it was just about as dark as inside a cow, I count it as a night dive
