As some examples,it analyzes the structure characteristic and work principle with Ameircan Alvin,Japonic SHINKAI6500 and Gallo Nautilus vehicle used to obtain buoyancy by jettisoning weight and equipments.

• 分析了美国“阿尔文”号、日本“SHINKAI6500”号和法国“鹦鹉螺”号潜水器抛弃重物和设备获得浮力实现上浮的工作原理和结构特点。