An account of Dr. Robert D. Ballard's exploration of the wreck of the Britannic in September 1995. Britannic, the sister-ship of the Titanic, was sunk after a mysterious explosion while serving as a hospital ship during World War One. Ballard sets out to relocate the wreck and attempts to prove once and for all whether it was a German mine or torpedo which inflicted the fatal damage.
| Actor | Role |
|---|---|
 Stacy KeachNarrator (voice) - US Version | Narrator (voice) - US Version |
 Mark HallileyNarrator (voice) - UK Version | Narrator (voice) - UK Version |
 Jacques-Yves CousteauSelf | Self |
| BBob BallardSelf - Expedition Leader | Self - Expedition Leader |
 Ken MarschallSelf - Historian-Artist | Self - Historian-Artist |