Thalassophobia (fear of of the sea, deep water, or even sea travel) is generally characterized by people who don't like to swim, don't do well on boats, or those who refuse to look out the window on planes when traveling over ocean. Part of the fear includes fear of the unknown in any body of water. So, naturally, images of menacing sea creatures also trigger this fear. From pictures of enormous real or fictional creatures barely touching an unsuspecting swimmer's feet, to photos of people swimming in deep water, thalassophobia can be triggered from the comfort of your own home. If any of the pictures of swimmers in danger, or even ones where they are perfectly safe, make you feel a sense of panic, no matter how small, then you may just have thalassophobia.