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High test peroxide is used as a rocket monopropellant, and was involved with the loss of the submarines HMS Sidon and Kursk.

Many things are used as rocket propellant not least of which O2. As in all things dose makes the poison.

You missed a prefix in monopropellant. That "mono-" is doing a lot of work that you ignored.

Oh, then add nitrous oxide. There, problem solved.

> That "mono-" is doing a lot of work that you ignored.

Ironic, given they generally produce less thrust.