Shawn Heinrichs has posted a great video about the encounter, and his excursion beneath the surface. Ballsy, and worth it.
About the video:
15 miles off the coast of Sri Lanka, a pod of Orcas trap a family of Sperm Whales. The action intensifies as the Orcas slam into the Sperm Whales, working as a unit to try and separate an individual and take down their prey.
Our story takes place on an epic expedition to Sri Lanka where our team spent 9 days at sea in search of Blue Whales. Accompanying me was my expedition partner Paul Hilton, my brother Brett, and close friends Douglas Seifert, Phil Sokol and Michael Umbscheiden. Together we battled rough seas, burning sun, cramped boat conditions and long days searching endless seas. Though not so successful with Blue Whales, what we did achieve was beyond anything any of us could have imagined, as we documented a world first underwater! This is our story!
The Earthist Chronicles 