USS Narwhal (D-1) Under construction. The date of the photo is Feb 7, 1909 The US Navy Submarine Force Museum
The torpedo tube doors used muzzle caps that rolled into place, rather than the later door-style system incorporated after the D-class. USS Narwhal (D-1) Under construction. The date of the photo is Feb 7, 1909 The US Navy Submarine Force Museum via PigBoats.com