Welding

Taking Damage
Upon taking damage from any source, your submarine will begin to leak water from different parts and rooms. To fix these leaks, you must weld the holes shut until water is no longer leaking. Welders are located on the center of the door in between the control room and the sensor room on both sides. You can store your welder in your inventory for easy access. To use the welder, activate it and hold it on the water leak until the hole is filled.

In order to remove the water that leaked into your submarine, use the pumps.