Four of the seven people killed when a luxury yacht sank off Italys coast last month likely died after depleting a pocket of air they had found while trapped inside the submerged ship, according to several reports.

Autopsies found that the victims Morgan Stanley International chairman Jonathan Bloomer, his wife Judith, lawyer Chris Morvillo and his wife Neda likely died from suffocation following the Aug. 19 sinking, Reuters reported Thursday citing judicial sources.

None of these four victims, who were found in the same cabin, had water in their lungs, suggesting they didnt drown, the BBC also reported citing Italian news agency Ansa.