"Air Brigade No. 1" is China's first tourism development of the submarine, the greatest pressuredepth of 50 meters, carried 40 people.
航旅一号“是我国研制的第一艘观光潜艇,最大耐压深度50米,可载客40人。”
2
A surplus allows snow to accumulate and for the pressure of snow accumulated over the years to transform buried snow into glacial ice with a depth great enough for the ice to flow.