Exactly. Creatures will stay completly docile around the submarine and no attack until you leave the submarine. So you can observe them trough the periscope in peace, including abyssal creatures.

This looks like a pretty cool sub, but I got a question. What exactly does the Passive Creatures mod mean by "makes creatures behave in a passive way around the main submarine."? Like do Molochs and other creatures just stay docile around the sub? Sorry for the dumb question, further apologies if you got an aneurysm reading