Whilst researching the availability of unmanned sub-hunters I came across the Swedish Bofors Torpedo 2000.
This amazing weapon is propelled by HTP and oil fuel, it has a swashplate motor and has wire communication to the launch vessel.
Marvellous! But wait; weren't we working on exactly the same torpedo technology over sixty years ago?
p.s. HTP is dangerous, unstable stuff and caused the sinking of HMS Sidon and the Russian Submarine Kursk.
The Germans called it T-stoff; should have been instabil stoff.