[software] Subsurface is a software for logging and planning dives. It was initially designed and developed by Linus Torvalds and Dirk Hohndel in 2011.{cn|date=July 2014} Subsurface is free and open-source software distributed under the terms of the GNU General Public License version 2.{cn|date=July 2014} == Overview == Until version 3.9.2,... Found on http://en.wikipedia.org/wiki/Subsurface_(software)