The USS Requin submarine in the water at dusk

Exhibits

USS Requin Gateway

History

Evolution

USS Requin (SS 481) Submarine

A uniquely immersive experience!

Come aboard to learn how 80 men used their expertise, humor and sheer ingenuity to carve out a rough and adventurous life during USS Requin’s (SS 481) lengthy defense and scientific missions, some of which are still classified to this day! State-of-the-art and battle ready when it set out just days before the end of World War II, Requin holds the distinction of being the Navy’s first Radar Picket submarine.

Requin (SS 481) Hours

Open Wednesday–Monday: 10 am–4:30 pm
(weather and river conditions permitting)
Tuesdays: Closed

Mon., March 20: USS Requin submarine will open at Noon.

USS Requin Vital Statistics

Class: Tench
Building Yard: Portsmouth Naval Shipyard, Kittery, Maine
Length: 311’9”
Width: 27’3”
Height: 49’
Weight: 1,516 tons surfaced, 2,426 submerged
Engines: Four – 1,600-horsepower diesels
Generators: Four – 1,100 kilowatt direct current
Batteries: Two – 126 lead acid battery cells in each
Motors: Two – 2,700 horsepower
Fuel Capacity: 113,881 gallons
Cruising Range: 11,000 miles
Maximum Speed: 21 knots surfaced, 10 knots submerged
Maximum Depth: 412’
Crew: 10 officers, 71–95 enlisted men
Tour Length: 75–90 days
Maximum Time Submerged: 48 hours at a time

USS Requin Compartments

Cross section of a submarine

Conning Tower
Contains periscopes, steering, and torpedo launching equipment.

The Radio Room, which is still operational, is to the right on the way to the next compartment.
Mess Decks
24 men at a time could eat meals, spend free time, and watch movies from four tables.
Berthing
36 bunks for crew were housed between the mess decks and crew’s shower and toilet facilities.
Forward and After Engine Rooms
Four diesel engines, four generators, and two desalination tanks take up two compartments.
Maneuvering Room
All electricity, as well as the submarine’s speed, was controlled from a split console center.
Stern Room
Four torpedo tubes faced out the back of the submarine until 1946, when it was converted to a radar control center. Twenty-one bunks for crew hung from
hooks on the walls.
After Battery
126 lead acid battery cells were stored beneath Berthing.
Cold Storage/Pantry
4.5 tons of food were stored beneath the Mess Decks and throughout the submarine.
Control Room
Diving and surfacing controls line the walls around the submarine’s main gyrocompass.
Forward Battery
126 lead acid battery cells were stored beneath Officers Country.
Forward Torpedo Room
Six torpedo tubes face out the front of the submarine. The compartment could hold up to 18 torpedoes and had bunks for 14 crew.
Officers Country
Quarters for 10 officers and five senior enlisted men include staterooms, pantry, wardroom, and office.

How a Submarine Dives

Cross section of submarine - water and air in ballast tank

Submarines have ballast tanks between their inner and outer hulls. When the submarine is on the surface, the ballast tanks are filled with air and the submarine floats.

Cross section of submarine - water entering ballast tank, air being expelled

To dive, vents are opened on the bottom of the submarine to allow seawater into the ballast tanks. As the water rushes in, the air is forced out through vents in the upper hull. The change in weight causes the submarine to submerge.

Cross section of submarine - water being expelled

To surface, air is pumped back into the ballast tanks, which forces the seawater out through the bottom vents. The submarine rises as it becomes lighter. Movable fins on the submarine sides in the front and back allow the crew to control the depth and stability of the submarine.

Timeline

1944

August 24
– Keel laid Portsmouth Naval Shipyard, Kittery, Maine

1945

January 1
– Launched
April 28
– Officially commissioned
August 15
– In Pearl Harbor when WWII ended, completed sole war patrol
August 18
– Went back to port

1946

– Conversion to the US Navy’s first Radar Picket Submarine

1946–1959

– Patrolled the East Coast and Northern Atlantic during the Cold War

1959

June
– Converted to Fleet Snorkel submarine and large fiberglass sail installed

1968

June
– Reclassified with non-combat duties
December 3, 10:20 am
– Decommissioned

1969

– Became a Naval Reserve trainer in St. Petersburg, FL

1971

December 20
– Struck from the Navy list

1972

July
Became a tourist attraction in Tampa, FL

1990

April 9
– Congress passed a bill to allow Requin’s transfer to Carnegie Science Center
August 10
– Began trip up Mississippi River under tow to Ohio River
September 4
– Arrived in Pittsburgh