The U.S. Coast Guard attempted to train dolphins as lifeguards. The program, known as the "U.S. Navy Marine Mammal Program," involved training dolphins to assist in various tasks, including locating underwater mines and helping with search and rescue operations.
The dolphins were equipped with special harnesses and trained to locate objects underwater using their natural sonar abilities. They were trained to approach objects of interest, such as mines or lost equipment, and indicate their location to their human handlers.
Although the program primarily focused on using dolphins for military purposes, their exceptional swimming abilities and intelligence made them potentially useful in search and rescue missions as well. However, it's important to note that the use of dolphins as lifeguards is not a widespread or common practice within the U.S. Coast Guard or other rescue organizations.