Submechanophobia.

Submechanophobia is a specific phobia that involves an excessive, irrational, and persistent fear of submerged man-made objects, such as sunken ships, airplanes, and underwater machinery. Individuals with Submechanophobia often experience overwhelming fear or anxiety when exposed to images, videos, or real-life situations involving submerged machinery. This fear can be disproportionate to the actual threat posed by the submerged objects. Submechanophobia could be caused by a fear of the unknown, and the common terror of not knowing what lies beneath the waterline. Objects could be visually distorted by water and its movement, which could make them seem alive, and thus, possibly harmful.