A series of catastrophic electrical and other failures may have led to the crash of Malaysia Airlines Flight 370 over the Indian Ocean, according to a lawsuit filed in the U.S. on behalf of the families of 44 people on board the still missing plane. The lawsuit, filed Friday against Boeing in U.S. District Court in South Carolina, names seven malfunctions, from an electrical fire to depressurization of the plane’s cabin, that could have led to the crew losing consciousness, the plane’s transponder stopping its transmission and the plane flying undetected until it crashed after running out of fuel.

Australian officials defended their suspension of the fruitless deep-sea sonar search for Malaysia Airlines Flight 370, insisting on Wednesday that the enormous costs involved played no role in their decision to halt the nearly three-year hunt. Australia’s Transport Minister Darren Chester also said that while the search had been called off on Tuesday, work behind the scenes would go on, with experts continuing to analyze data associated with the doomed aircraft’s final hours and examining any future debris that washes ashore.