1. Submarines Of WWI
On the front and top were primitive propellers that could be turned from inside to provide movement. ... A line attached the device to an auger screw that would be drilled into the hull of the target vessel from underneath her. The screw would then released leaving the gunpowder charge attached to the ship. ... That turned out to be an advantage to the German designers. ... One U-boat had to turn back due to engine troubles. ...
- Word Count: 1988
- Approx Pages: 8
- Has Bibliography
- Grade Level: High School