Dive! Dive! Dive!

You won't have often seen this - a boat head for the harbour wall at top speed then pull on the handbrake. The incredible manoeuvrability of this new prototype RNLI lifeboat class, the Shannon, is due in part to the fact that it has no propellers.

Instead it has two powerful water jets squirted through two independently directable nozzles giving it both incredible speed (around 30 knots) and the ability to turn in its own space, slide sideways and creep/crawl forwards and backwards with a level of precision simply not possible with conventional propulsion systems.

So, to put on the brakes, keep full throttle and just spin the nozzles 180 degrees. None of this drop the revs to idle, gearbox to neutral, gearbox to reverse, throttle up nonsense.

Another blipper's view here.
Wiki.