The important feature of this boat was a diver’s compartment, enabling divers to leave the vessel when submerged, for the purpose of operating on wrecks or performing other undersea duties. 佚名.神奇的知识之书.
The navigation of the air approaches it in character, but does not present the vital problems of undersea travel. 佚名.神奇的知识之书.
This new type of vessel, the Deutschland, was an undersea craft of 315 feet length and a gross tonnage of 701 tons, its cargo capacity being more than 1,000 tons. 佚名.神奇的知识之书.
She was a double-deck vessel controlled by Lake hydroplanes, and had installed steam power for surface travel and electric power for undersea work. 佚名.神奇的知识之书.
The first underseas cable was laid in 1851 between France and England. 赫伯特·乔治·威尔斯.世界史纲.