Access Extended: Ioan Gruffudd & Alice Parkinson Talk 'Sanctum' (Part II)

Access Extended: Ioan Gruffudd & Alice Parkinson Talk 'Sanctum' (Part II)

Ioan Gruffudd and Alice Parkinson chat with Access about learning to use the breathing tools they used while cave diving. What is a re-breather and how is it different from a scuba tank? Plus, what was it like working with producer James Cameron?