4min 32sec clip - First Time Filmed in a Decade — Underwater Volcano Eruption (Kavachi)

found via laughingsquid

6min 48sec clip - The Spanish 'ghost town' that should be underwater

4min clip - The #diving #gondola: a strange elevator to the ocean floor

text from youtube "On the German coast of the Baltic Sea, there's a tourist attraction that I think is very strange: the "Tauchgondel", a room that sinks under the waves and lets you go diving... without getting wet."

5min 37sec @TEDEd clip - How the world's longest #underwater #tunnel was built - Alex Gendler

Discover how the English Channel Tunnel was built and the engineering challenges of building a 200 kilometer long tunnel underwater.

Flanked by two powerful nations, the English Channel has long been one of the world’s most important maritime passages. Yet for most of its history, crossing was a dangerous prospect. Engineers proposed numerous plans for spanning the gap, including a design for an underwater passage more than twice the length of any existing tunnel. Alex Gendler details the creation of the Channel Tunnel.

Lesson by Alex Gendler, directed by Studio Kimchi.