Jill Heinerth explored the submerged caves and crevasses of an enormous iceberg. There was an incredible array of wildlife to document, but the dive was extremely risky. Show more
Discover 11,128,835 listings and 277,860 playable programmes from the BBC
Jill Heinerth explored the submerged caves and crevasses of an enormous iceberg. There was an incredible array of wildlife to document, but the dive was extremely risky. Show more