Submechanophobia (from Latin sub ‘under’; and from Ancient Greek μηχανή (mechané) ‘machine’ and φόβος (phóbos) ‘fear’) is a fear of submerged human-made objects, either partially or entirely underwater.^[1][2] These objects could be shipwrecks, statues, sea mines, animatronics as seen in theme parks, or old buildings, but also more mundane items such as buoys, chains, and miscellaneous debris.,

Thalassophobia (from Ancient Greek θάλασσα (thálassa) ‘sea’ and φόβος (phóbos) ‘fear’)[1] is the persistent and intense fear of deep bodies of water, such as the ocean, seas, or lakes. Though related, thalassophobia should not be confused with aquaphobia, which is classified as the fear of water itself. Thalassophobia can include fears of being in deep bodies of water, the vastness of the sea, sea waves, aquatic animals, and great distance from land.[2]