While looking for open source dive log applications on F-Droid (in preparation for my Advanced Open Water Certification) and I found an app called Subsurface and apparently it is as developed by none other than Linus Torvalds himself.
I also found this neat YouTube video of Dirk Hohndel talking about scuba diving with Linus.
I just saw an article saying Gabe Newell of Valve is obsessed with scuba diving. Must be something in the water.
Scuba diving is awesome (fucking expensive though), I think everybody should give it a try.