The USN has a deep submersible research station on Seneca lake's deepest part. It's 633 feet deep. The second deepest lake in the USA!
https://www.navsea.navy.mil/Home/Warfare-Centers/NUWC-Newport/What-We-Do/Detachments/Seneca-Lake/
Seneca Lake also has a WW2 era Army depot on its east shore at Sampson State Park. It was said to house nuclear weapons at one point. It now has a heard of white deer due to a genetic mutation in the heard that was originally isolated inside the high fence of the depot.
The "White Deer of OVID"
I thought it was 9.5" long that looks like it's a foot!
My favorite lake for lake trout! Nice landlocked salmon fishing too!