Superyacht sinking investigators admit they failed to give surviving crew drink and drugs tests – as questions surround Bayesian’s fate that saw all but one staff escape while six passengers died including Hannah Lynch, 18, and tech tycoon father Mike [Video]

Prosecutors investigating how the £30million superyacht Bayesian came to sink off the coast of Sicily say they have as-yet-unanswered questions for the crew who escaped the sinking ship as seven others died.

Six passengers – including British tech tycoon Mike Lynch and his daughter Hannah – died alongside one member of the crew when the British-flagged pleasure yacht capsized and came to rest on its side 50 metres below in the early hours of Monday.

A press conference held earlier today after search efforts concluded raised more questions than answers as investigators admitted they were still piecing together how exactly the ship came to sink – and why so many passengers died.

Italian prosecutors have admitted they did not conduct alcohol and drug testing on the vessel’s crew – all but one of whom survived – because they needed treatment and were in shock. They have vowed to question the sailors intensively.

A weather phenomenon known as a …