"Designed to be able to be launched out of a submarine's torpedo tube, and assembled in 15 minutes"

Hummmmmm. So it shoots out of the torpedo tube and the proposed pilot climbs out the top of the submarine and quickly swims over to these parts contained in a 3 meter x 0.5 meter tube. While treading water with 1 hand the pilot quickly assembles the helicopter with his other hand in 15 minutes. HUUUMMMM?

Then.... the pilot quickly climbs up onto this helicopter which has no floats, manages to get the engine started and waits for the next wave so that he can take off?