The Cross Sinker is the boss on the sixth stage of Strikers 1945 II. It is a gargantuan submarine stationed off the coasts of Brazil by the time it is attacked by the Strikers.
The Cross Sinker's hull has a distinctive dagger-like shape, which is uncommon amongst WWII-era submarines. Once it fights the Strikers, the submarine extends its sides to reveal two large bullet launchers, giving it the view of a cross when looked from above, hence its name.
When the Cross Sinker takes enough damage, it flips over to the back to transform into a crab-like mecha. It has a red claw on its right arm that darts down-leftwards on attack, releasing bullets from its back in the process, and a gun on its left arm that fires either a straight, trident-patterned shot or a wide-spreading shot to the right. It can also transform into a second mode that releases bullets in a wide conical pattern.