KUALA LUMPUR, Malaysia — More than a decade ago, Malaysia Airlines Flight MH370 vanished without a trace, sparking one of aviation’s most baffling mysteries.

Despite years of multinational searches, investigators still do not know exactly what happened to the plane or its 239 passengers and crew.

On Wednesday, Malaysia’s government said American marine robotics company Ocean Infinity would resume a seabed hunt for the missing plane on Dec. 30, reigniting hopes that the plane might finally be found.

A massive search in the southern Indian Ocean, where the jet is believed to have gone down, turned up almost nothing. Apart from a few small fragments that washed ashore, no bodies or large wreckage have ever been recovered.

Here’s what we know about the deadly aviation tragedy.

The Boeing 777 disappeared from air-traffic radar 39 minutes after departing Kuala Lumpur for Beijing on March 8, 2014.

The pilot’s last radio call to Kuala Lumpur — “Good night, Malaysian Three Seven Zero”— was the final communication before the plane crossed into Vietnamese airspace and failed to check in with controllers there.

Minutes later, the plane’s transponder, which broadcasts its location, shut down. Military radar showed the jet turn back over the Andaman Sea, and satellite data suggested it continued flying for hours, possibly until fuel exhaustion, before crashing into a remote section of the southern Indian Ocean.

Theories about what happened range from hijacking to cabin depressurization or power failure. There was no distress call, ransom demand, evidence of technical failure or severe weather.

Malaysian investigators in 2018 cleared the passengers and crew but did not rule out “unlawful interference.” Authorities have said someone deliberately severed communications and diverted the plane.

MH370

KUALA LUMPUR, Malaysia — More than a decade ago, Malaysia Airlines Flight MH370 vanished without a trace, sparking one of aviation’s most baffling mysteries.

Despite years of multinational searches, investigators still do not know exactly what happened to the plane or its 239 passengers and crew.

On Wednesday, Malaysia’s government said American marine robotics company Ocean Infinity would resume a seabed hunt for the missing plane on Dec. 30, reigniting hopes that the plane might finally be found.

A massive search in the southern Indian Ocean, where the jet is believed to have gone down, turned up almost nothing. Apart from a few small fragments that washed ashore, no bodies or large wreckage have ever been recovered.

Here’s what we know about the deadly aviation tragedy.

The Boeing 777 disappeared from air-traffic radar 39 minutes after departing Kuala Lumpur for Beijing on March 8, 2014.

The pilot’s last radio call to Kuala Lumpur — “Good night, Malaysian Three Seven Zero”— was the final communication before the plane crossed into Vietnamese airspace and failed to check in with controllers there.

Minutes later, the plane’s transponder, which broadcasts its location, shut down. Military radar showed the jet turn back over the Andaman Sea, and satellite data suggested it continued flying for hours, possibly until fuel exhaustion, before crashing into a remote section of the southern Indian Ocean.

Theories about what happened range from hijacking to cabin depressurization or power failure. There was no distress call, ransom demand, evidence of technical failure or severe weather.

Malaysian investigators in 2018 cleared the passengers and crew but did not rule out “unlawful interference.” Authorities have said someone deliberately severed communications and diverted the plane.

MH370