I've recently been on a trip to Long Island, NY, and came back with a few ideas to put together, maybe for a scenario. In the meantime, here's a wonderful picture that I came across of the first diving suit, tested in the Long Island sound. An older Chester E MacDuffee may be making an appearance as an NPC
Pictured here is Chester E. Macduffee and his newly-patented creation, the diving suit. It was made of aluminum alloy and weighed over 550 pounds, which is exactly the kind of thing you want to be strapped into when you’re thrown into the ocean. The invention did help advance deep-sea diving when, in 1914, the suit reached new depths of 212 feet in the Long Island Sound.