It's placed in contact with the water, and it indicates the outside pressure on our hull, which in turn gives me the depth at which my submersible is sitting.

它是跟海水相通的，可以指出外面海水的压力，因此，我便知道我这船所在的深度。

The compass still showed our heading as east-northeast, the pressure gauge indicated a pressure of five atmospheres (corresponding to a depth of fifty meters), and the electric log gave our speed as fifteen miles per hour.

罗盘仍是指着东北偏东方，气压表正指五气压，表示船在五十米的深处，电力测程器让我们知道船行是每小时十五海里。