Common Activities Undertaken by Diving Services New Zealand Ltd

• Underwater video and closed circuit TV (CCTV-HD) with communications to surface
• Seafloor searches - side scan sonar
• Still photography - standard or digital
• Lloyd’s Register classified in-water surveys
• Det Norske Veritas GL classified in-water surveys
• Underwater cutting, grinding, drilling, ultrathermic cutting , hydraulic chainsaw, pile removal
• Underwater ultrasonic thickness testing
• Hull cleaning
• Propeller polishing
• Sea chest cleaning
• In‑water valve replacement including overboard valves and sea chests
• Anode replacement – vessels, sheet piling, pipelines, cathodic testing
• Transducer and sonar maintenance including in‑water replacement and repair
• Salvage and recovery
• Stern bearing clearances
• Underwater plastering - epoxy and cement
• Pipeline inspections and high‑volume jet cleaning
• Confined space work
• Underwater Venturi and Jetting systems
• General ship repair
• Underwater ramset, bolts, nails etc.
• Contaminated environment diving – sewers and toxic
• Research diving- sampling, benthic sleds, benthic grab sampling
• Slipway diving including blocking and maintenance
• Marine farm maintenance
• ROV services – 150 meter inspection class ROV with manipulator arm
• Wet welding and cutting – hull repair and construction services
• Explosives - demolition
• Screw anchor installation and mooring inspection, recovery and supply
• Vibracoring