Northvolt's CEO says the key driver behind the startup is to make Europe self-efficient and less reliant on China for supplies.

Chile is part of a South American region known as the "lithium triangle," where miners are trying to meet skyrocketing demand for the material.

The fire started in the boat's salon, where divers had plugged in phones and other devices. Investigators pointed to the lack of a night watchman as a reason for high casualty numbers.