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This was intended to allow the U-Boat to reposition out of harms way after conducting an attack. At 24 kts it allowed the attacker little if any time to effectively mount a response. Conversely the drive could be used to position for attack if you need to reposition. U-792 and 794 Type XVIIa ships with U-792 achieving 25 kts during trials. Hydrogen Peroxide H2O2 was the fuel source which was also a a fuel source for the V-2 and was in high demand but short supply. It should also be noted that while western navies and the Soviets experimented with this as a fuel source the mixture is extremely explosive and caused a number of memorable accidents which sank the ship carrying the system. Also of note this is also been reported as a propulsion source for torpedoes and was the likely culprit for the sinking of the KURSK.