Many submarines are equipped with underwater-launched weapons, such as Cruise missiles (or Polaris, in a previous era).
Today’s invention is to use these for the humanitarian purpose of rescuing sailors.
In the event that a vessel was firmly stuck on the sea bed, each of its missiles could be automatically engaged with the casing, via a locking ring attached a number of high-tensile chains.
Firing the missiles sequentially could then provide a means of forcing the sub to the surface in a reasonably controlled fashion.
