When a boat capsized on Lake Tahoe in California last month amid large waves, killing eight people on board including a DoorDash executive, the only two survivors were found wearing or clinging to a life vest, according to the National Transportation Safety Board.

None of the eight people who died following the capsizing of a boat in Lake Tahoe last month after a sunny day suddenly turned stormy were wearing life vests, according to a preliminary investigation from a federal agency.