I know a Seneca probably cannot carry 6 people in this way, but surely one should never fly without a visual check on the fuel level?
I am surprised at what some people will do. There was the much publicised event years back of a well know balloon pilot taking off early morning into solid IMC in a push pull cessna twin.
Being in a hurry and thinking no one had used the aircraft since he filled it a few days earlier he merrily flew on his way till both engines stopped over the top of Gloucester (formally Staverton)
Being told by ATC that the cloudbase was some 400 feet AGL he spiraled down around the NDB.
Breaking out he landed on one of the multiple runways at Gloucester.
People are People and we do some very silly things sometimes