Alligator Class.

(Completed 1908–9.)

Four submarines of the improved Lake type. They have a submerged displacement of 500 tons. Their speed is 15 knots on the surface and 10 knots when submerged. They are fitted with two bow and two stern tubes, and carry six 18-inch Whitehead torpedoes. Their complement is seventeen officers and men. (See also page [96].)