800t grab

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

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

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