Video shows a MK48 "Dummy" being launched from a Dutch Submarine. This footage was partially used by RTL7's "Onderzee" documentary.
The dummy has no Controls, Warhead or Sonar and floats to the surface once launched. The 7 Meter long torpedo is being accelerated with up to 2G and does not remain under the surface like a " Warhead" would.
You can hear beeps, these are nearby sonar transmissions and eventually the Torpedo will activate it's beacon for position broadcasting. A nearby support ship will retrieve the Torpedo.
Episode Onder Zee : https://vimeo.com/103430735