H. L. Hunley, also known as the Hunley, CSS H. L. Hunley, or CSS Hunley, was a submarine of the Confederate States of America that played a small part in the American Civil War. Hunley demonstrated the advantages and dangers of undersea warfare. She was the first combat submarine to sink a warship (USS Housatonic), although Hunley was not completely submerged and, following her attack, was lost along with her crew before she could return to base. Twenty-one crewmen died in the three sinkings of Hunley during her short career. She was named for her inventor, Horace Lawson Hunley, shortly after She was taken into government service under the control of the Confederate States Army at Charleston, South Carolina.

Source: Wikipedia

Controls:
AG-1 Engine Normal/ Engine Reverse
AG-2 Launch Torpedo
AG-3 Open Hatches
AG-4 Raise Air Intakes
AG-5 Throw Ballast

To Control:
Roll: Turn
VTOL: Pitch
To dive in:
1: Set the pitch to 100% down.
2: When it stops going down, set it to 50% down and turn a little.

To Attack:

1: Descend approximately -4.5 m (-15.0 ft) depending on the enemy ship.
2: Hit one of the sides of the enemy ship.
3: Toggle AG-1 and AG-2 at the same time and set the pitch up.
4: Wait for it to reverse away and detonate the bomb (rocket symbol).