An accident report says three fishermen died when their vessel sank, because their incorrectly stowed life-raft failed to float free and automatically inflate.
The three men had set off from Weymouth on the wooden potting 'Purbeck Isle' vessel when it foundered nine miles off Portland Bill in May last year.
Had the liferaft floated free and inflated it was "entirely possible" that the fishing boat's skipper David McFarlane, 35, and his crewmen, Jack Craig, 21, and Robert Prowse, 20, would have been saved, the report said.
More top news
Find out which train services will be affected by the strike - and plan your bank holiday accordingly.
Bob Crampton warns that it will be showery and blustery over the next few days but the sunshine will still get a look in.
Bath centre Sam Burgess has made it into the England squad for the Rugby World Cup just ten months after switching codes.