Steverooo said:
YMMV. Many people seem to find my point of view silly, in a fantasy game.
Not at all. It's all part of the "willing suspension of disbelief" / "Go with what you know" package. At one point, the BPAA PCs used "armor" fashioned of decomposing seaweed, to keep warm (yes, that was a bit of a stretch), while ingesting "floatweed berries" to counter the pressures of the deep. Compared to a "no magic" scenario, both options would seem quite ludicrous. Still, the PCs had to adventure to find both items, so it worked out nicely.
Drylanders, aka "Those Above" would have quite a bit of difficulty in my campaign, as it is geared for those at home beneath the waves.
Offline, I am fascinated by marine life. I have 750 gallons in saltwater aquariums and got Discovery HD solely on the hopes that Shark Week would be available in HDTV ("Sharks Under Glass" on Discovery HD this month!). I try to work common sea creatures and topography into the campaign, for added realism. Granted, the players wouldn't know an imperator angel from a majestic angel, but I feel better for being able to envision the setting myself.
Then, when things seem almost normal, I throw in the sea hags and aquatic demons.
In the end, I'm just happy to see other DMs consider undersea adventures, whether they are no magic, low magic, or Monty Hall.