Effects of Non-Operational Subsystems
Bow Sonar – Your passive and active sonar sensitivity are greatly diminished, effectively rendering you nearly blind underwater.
Towed Array – No longer functions.
Periscope – Periscope mast can no longer be raised and can no longer be used.
ESM Mast – This mast can no longer be raised and no longer provides ESM data.
Radar Mast – This mast can no longer be raised and no longer provides radar data.
Tubes – Individual torpedo tubes can be rendered unusable and cannot be repaired at sea. A torpedo tube will have the wire cut (if one exists) or the weapon within it lost (if one is loaded) upon being knocked out. Some submarines have angled tubes in their sides behind the bow. Attempting to fire an angled tube at higher speeds (20+ knots) has a chance to jam the torpedo, rendering the tube disabled as well as loss of the weapon jammed in the tube.
Fire Control – Loss of your fire control computer immediately halts all TMA (target motion analysis) of contacts and clears all contacts you were tracking.
Pumps – Pumps automatically decrease the rate of flooding across all compartments. Once knocked out, flooding of compartments is no longer offset by pumping of water. In addition, the bonus to pumping in the compartment containing the damage control party is lost.
Propulsion – Propulsion consists of engines, propeller shafts and the propellers themselves. Damage to propulsion decreases maximum speed of your vessel, limiting maximum telegraph setting to 2/3 Ahead.
Rudder – When steering, reduces the turn rate of your vessel by half.
Planes – When using planes to change depth, reduces the surface and dive rate of your vessel by half. Ballast – When using ballast to change depth, reduces the surface and dive rate of your vessel by half. Emergency blow ballast cannot be used.
Reactor – If damaged or if your crew is forced to SCRAM the reactor, power is lost to the engines. This limits maximum telegraph setting to All Stop, effectively rendering your vessel dead in the water.