HMS Truncheon (pennant number P353) was a group three T Class submarine

British T class submarine

The Royal Navy's T class of diesel-electric submarines was designed in the 1930s to replace the O, P and R classes. Fifty-three members of the class were built just before and during the Second World War, where they played a major role in the Royal Navy's submarine operations...

 of the Royal Navy

Royal Navy

The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

 which entered service in the last few months of World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

. So far she has been the only ship of the Royal Navy to be named Truncheon. She was sold to Israel

Israel

The State of Israel is a parliamentary republic located in the Middle East, along the eastern shore of the Mediterranean Sea...

 in 1968 and commissioned into the Israeli Sea Corps

Israeli Sea Corps

The Israeli Navy is the naval arm of the Israel Defense Forces, operating primarily in the Mediterranean Sea theater as well as the Gulf of Aqaba and the Red Sea theater. The current commander in chief of the Israeli Navy is Aluf Ram Rothberg.-History:...

 as INS Dolphin.

As HMS Truncheon

At the end of the war, all surviving Group 1 and Group 2 boats were scrapped, but the group 3 boats (which were of welded rather than riveted construction) were retained and fitted with snort masts

Submarine snorkel

A submarine snorkel is a device which allows a submarine to operate submerged while still taking in air from above the surface. Navy personnel often refer to it as the snort.-History:...

.

Truncheon was sold to the Israeli Navy

Israeli Sea Corps

The Israeli Navy is the naval arm of the Israel Defense Forces, operating primarily in the Mediterranean Sea theater as well as the Gulf of Aqaba and the Red Sea theater. The current commander in chief of the Israeli Navy is Aluf Ram Rothberg.-History:...

 in 1968, and renamed Dolphin.

As INS Dolphin

The submarine was purchased by Israel

Israel

The State of Israel is a parliamentary republic located in the Middle East, along the eastern shore of the Mediterranean Sea...

 in 1968. Two of her T-class sisters, HMS Turpin

HMS Turpin (P354)

HMS Turpin was a group three T Class submarine of the Royal Navy which entered service in the last few months of World War II. So far she has been the only ship of the Royal Navy to be named Turpin...

 and HMS Totem

HMS Totem (P352)

HMS Totem was a group three T class submarine of the Royal Navy which entered service in the last few months of World War II. To-date, she is the only ship of the Royal Navy to have been named Totem....

, were also sold to Israel. She was commissioned

Ship commissioning

Ship commissioning is the act or ceremony of placing a ship in active service, and may be regarded as a particular application of the general concepts and practices of project commissioning. The term is most commonly applied to the placing of a warship in active duty with its country's military...

into the Israeli Sea Corps in 1968.

She was eventually scrapped in 1977. By the time of her decommissioning, she was the only T class submarine in service in the world.