Drive unit for underwater vehicles

There will be described a drive unit for underwater vehicles, wherein the drive unit has two propellers (12, 14) which are each coupled via a drive shaft (22, 42) with a separate drive (20, 40). A first drive shaft (22) is formed as a hollow shaft, wherein a second drive shaft (42) is guided through the form of a hollow shaft first drive shaft (22). The drives (20, 40) are arranged one behind the other, wherein the second drive shaft (42) coupled through the first drive shaft (22) drive (20).