I was thinking about rules for breathing underwater and stumbled on some interesting maps:

The above map was found here: http://web.stanford.edu/~thossler/assets/downloads/HosslerMasterThesis.pdf

Some more interesting maps like the above can be found here: http://www.igme.es/Boletin/2016/127_1/BG_127-1_Art-12.pdf

Not much to add … except a few more drawings:

UPDATE: Reddit user GrendelFriend pointed me to this webpage, which looks neat: Caveatlas.com. For example, clicking randomly about , I found this map (so there must be more great stuff on this page):

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Me on DriveThruDriveThru; at the moment I’m mainly pimping my procedural adventure ‘Carapace‘ about a giant ant colony.