Water WorldsPhần 1Tập 7

The Sea of Glass

Documentary
English
Once thought extinct, glass sponge reefs are rediscovered in the 1980s deep off Canada's West Coast. Scientists and researchers need specialised deep-sea technology to study these ancient and fragile ecosystems.
Phụ đề:
English (CC)
Quốc gia:
Canada
Đạo diễn:
Diễn viên:
Lời khuyên:
Adult Themes