Coastal diver is a job title for someone who dives in coastal waters. The term 'coastal diver' can be abbreviated to the four-letter word 'TERN'. A coastal diver is responsible for underwater activities such as inspecting and repairing ships, bridges, and other structures, as well as searching for lost objects. They may also be involved in scientific research, underwater photography, or other activities related to the ocean. Coastal divers must be highly trained and certified in order to safely perform their duties.