A cargo ship transporting 3,000 cars was abandoned in the middle of the Pacific Ocean on Tuesday after a massive fire broke out. As of Friday, the ship was still burning. The blaze may have been fueled by the vehicles’ lithium-ion batteries, which are notoriously difficult to extinguish once ignited.

A cargo ship named Morning Midas, carrying about 3,000 vehicles, including approximately 800 electric models, was abandoned in the Pacific Ocean after a fire.

A fire broke out aboard the Morning Midas, a 600-foot Liberian-flagged cargo ship traveling from China to Mexico with more than 3,000 vehicles onboard—751 of them either fully electric or hybrid models.