USS Mackerel (SST-1)

USS Mackerel (SST-1)

USS Mackerel (SST-1), originally known as USS T-1 (SST-1), was the lead ship of the T-1-class of training submarines. She was the second submarine of the United States Navy named for the mackerel, a common food and sport fish, and was in service from 1953 to 1973. She was one of the smallest operational submarines ever built for the U.S. Navy.