Bad weather meant the vessel could not be towed into port at Crotone and it disappeared under the waves.
Footage released by the Italian coast guard shows the moment a yacht sank off the coast of Calabria.
Earlier, the passengers and crew on board the 40-metre yacht were rescued.
Local reports say a patrol boat picked up the first four passengers and one crew member and took them to Catanzaro Marine.
A tug boat then arrived and rescued the other four crew members.
However, bad weather conditions mean the yacht could not be towed to a port in Crotone, and it disappeared under the waves.
The coast guard said an investigation had been launched.
Watch the video in the player above.