bids are invited for under water diving up to depth of 60.00 meter at surge shaft of sewa-ii power station for arresting water leakage upto workable limit (upto the satisfaction of eic), inspection & removal of any unwanted material from gate grooves and sill beam of surge shaft gate. , ideal charges of diving team, if due to any reason pertains to nhpc, diving work not carried out after deployment of divers at site , providing and fixing of winch machine, jhula, air compressor receiver tank and fabrication work etc for up and down of divers in surge shaft , mobilization and demobilization of diving team along with all diving equipments, air compressor, winch machine etc.