How do you cut a giant steel pipe a mile below the surface of the ocean?

The Deepwater Horizon was connected to the seabed by a steel pipe called a riser - 21 inches wide and a mile long.

After the rig sank, BP needed to cut away the riser pipe above the blowing out well - a complex job never attempted before a mile below the waves.

Release date:

Duration:

3 minutes

This clip is from