Certificate of occupational health and safety management system

Underwater salvage refers to the process of salvaging flooded objects or removing navigation obstacles in channel and port waters.Underwater fishing design survey. diving. Jam. Underwater blasting. Un

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. Underwater search: two search team members in each group enter the water in the order planned in advance. The team member who arrives at the bottom table first must wait until another team member a