When I think of the ocean, I think of Godzilla.
I think most DMs/GMs/et al tend to shy away from deep oceanic adventures. I know I do because in a fantasy campaign one must fiddle around with characters having to breathe, see, survive, fight, and sometimes cast spells underwater. It is difficult at best. Right up there with 1st Ed AD&D planar travel.
In more modern settings, everything is usually cool unless the players find themselves running out of air, losing hull integrity of their vessel, or having to travel outside of a ship. On the other hand, really scary, huge things live underwater. Things such as kaiju.
I’m worked with an adventure for Season 1 of my Power Rangers RPG campaign that covered the topic of kaiju. The presence of something similar to Godzilla wandered up on shore near Bennett’s Cove and and to be guided back out to sea.
Of course, the military, the Rangers, and even the bad guys were all super confused by the presence of such a monster that was seemingly under no one’s control. The creature rampaged because a nuclear plant was being built nearby and it felt the need to let the humans know that it was not okay to build one. The Rangers fought compassionately to get the creature back out to sea without wrecking the city. In true Mighty Morphin fashion, no one was seriously injured, but the nuclear plant’s construction site was smelted into glass by the kaiju’s breath weapon and stomped on by the Megazord. Needless to say construction has halted.
Who knows what other gigantic things could be lurking in the waters of a deep ocean. Real life humanity has barely explored most of the deep blue. Giant squid, sharks, and other sea life could be just the tip of the proverbial iceberg. There is always more lurking below.
Thanks for stopping by. I appreciate you! Have a great rest of the week.