A new film has shown how US accident investigators tackled the probe into the fatal sinking of the El Faro in 2015.

The 15-minute video has been released by the National Transportation Safety Board (NTSB).

It aims to summarise the investigation into the tragedy that killed all 33 crew in a hurricane.

The film examines NTSB’s determination of the cause of the accident and discusses associated recommendations to improve marine safety.