Helium oxygen mixture diving system

Underwater fishing is dangerous, so it is very necessary to make preparations in advance. Before underwater fishing, please use lifting tools to prepare in advance. Next, follow Xiaobian to understand

What is the treatment principle of sunken ship salvage underwater engineering? The basic principle of underwater engineering is chemical grouting. Chemical grouting is to inject the pressure polymer m

(1) Investigate the landscape image, water depth, water temperature, flow rate and other environment of the operation area. It can be operated only when the wind force on the water surface is less tha