Submechanophobia

Submechanophobia is the fear of. People with submechanophobia are often afraid of large propellers, buoys, sunken ships, or underwater animatronics. It is similar to Thallasophobia, fear of the ocean. People may think they can be sunk into the man made object or any dangerous creatures or dead bodies could pop up in front of them.

There are many examples of submechanophobia. Ranging from underwater animatronics to sunken ships and airplanes. https://www.reddit.com/r/thalassophobia/comments/5byfn7/this_is_probably_my_worst_fear_giant_ship_boat/