@Monsen Here are the maps for the Kaballah Ruins.

Or you could leave D&D and it's ilk behind and play Mythras. There is a sorcery spell Abjure (Substance). If you cast, Abjure (Air) on your party (easy enough to do with a decent skill score) breathing underwater is not an issue as you don't need air to survive...well, at least for the duration of the spell...

Edited just for you?

And an updated 'final' version of the Caves...

Hi Folks,

Here is a bit of an update. Apart from some minor tweaks this is done.

Is it possible to get a curved line with double arrows as in the original posted above? I know you can do straight ones by right-clicking on the line tool...