Episode #2.1

The news report at 4m40s lists the tsunami from series 1 finale as being a "powerful Scale 12 tsunami," which struck the North Sea coastline, and hit areas of the UK, Netherlands, Germany,& Denmark. The higher levels of tsunamis from the NOA website are categorized below: IX. Destructive Most small vessels are destructed or washed away. Many large vessels are moved violently ashore, few are destructed. Extensive errosion and littering of the beach. Local ground subsidence. Partial destruction in tsunami control forest, stop drifts. Most aquaculture rafts washed away, many partially damaged. Damage of grade 3 in many masonry buildings, few RC buildings suffer from damage grade 2. X. Very destructive General panic. Most people are washed away. Most large vessels are moved violently ashore, many are destructed or collided with buildings. Small boulders from the sea bottom are moved inland. Cars overturned and drifted. Oil spill, fires start. Extensive ground subsidence. Damage of grade 4 in many masonry buildings, few RC buildings suffer from damage grade 3. Artificial embankments collapse, port water breaks damaged. XI . Devastating Lifelines interrupted. Extensive fires. Water backwash drifts cars and other objects in the sea. Big boulders from the sea bottom are moved inland. Damage of grade 5 in many masonry buildings. Few RC buildings suffer from damage grade 4, many suffer from damage grade 3. XII. Completely devastating Practically all masonry buildings demolished. Most RC buildings suffer from at least damage grade 3.

At the bottom in the workshop, they have a water pool. If they are in 100 meters of water then the need 100 meters of atmospheric pressure to keep it contained. But all workers just come and go if its not a problem. At 100 meters depth you would need mixed air and would have a squeaky voice.