Kai, found something on rocket launches from U-Boats. Very interesting reading and pics.

go to this link.

www.princeugen.com

I knew somebody would have tried it. There's even a bit on the suggested V2 sub launches.

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"We have invaded space with our rocket and for the first time - mark this well - have used space as a bridge between two points on the earth; we have proved rocket propulsion practicable for space travel. This third day of October, 1942, is the first of a new era of transportation, that of space travel." - General Walter Dornberger