A new documentary reveals the incredible results of a project to create 3D underwater scans of the doomed ocean liner RMS Titanic, which sank 113 years ago.

The scan provides a new view of a boiler room, confirming eye-witness accounts that engineers worked right to the end to keep the ship's lights on. And a computer simulation also suggests that punctures in the hull the size of A4 pieces of paper led to the ship's demise.

A shattered porthole, likely smashed by the iceberg, is one of several haunting new details uncovered in a fresh look at Titanic’s 3D scans.