Before you can adopt something, you have to know where it is first.
It's been quite a while, so I'm not sure where I've kept the files. The amount of work that was done on this map was tiny, so you might as well start from scratch. The only interesting thing was the custom underwater glass shader I made for this map.
To answer your questions, these days I don't work on maps anymore. Back in the day, I made maps for GoldSrc mods (CS 1.6, Sven Co-op), Counter-Strike Source, and worked with a few mod teams. I uploaded a few maps to various websites, but they might not even exist anymore.
Fathoms was basically going to be my first TF2 map, but then I quit because I picked up programming and became a game developer. I just lack the time to work on maps now. I would love to see someone else do an underwater map.