01、Underwater inspection 02、Underwater embalmed 03、Underwater cleaning desilting 04、Underwater welding and cutting 05、Underwater submarine cable lay 06、Underwater crack 07、The underwater topography surv 08、Underwater reinforcement 09、Under water blasting 10、 Underwater construction and i 11、ROV underwater operations 12、Diving with helium-oxygen mixt 13、Large-depth atmospheric diving 14、Underwater Engineering Service