Botany Bay Cable Project (Energy Australia) Viscas Corporation
Duties:
- Seabed probing survey to 6m of depth along the proposed cable rout
- Assist with direction drilling program including removal and drilling tools and HDPE haul back operations of 300mm dia by 500m long conduits
- Assist and advise during cable hauling operations into La Perouse
- Direct cable floating and towing operations into Silver Beach of all 6 cable installations
- Trefoil cable configuration for a distance 800m through rocky shoals area (Watts Reef) and through sensitive sea grass area to Silver Beach Kurnell
- Carry out seabed coring to a depth of 3m in the channel area to locate depth of soft material and sandstone rock outcrop
- Supply all vessels for cable flotation into omega configuration and towing to Silver beach
- Carry out as laid seabed survey and inspection of cables for complete length of all cables on seabed
- Carry out remedial burial of cables to a depth of 1.5m through sand material
Photos:
Cable barge Steel Hauler loaded with cable ready for deployment to site.
Seabed probing with 6m LP pressure jet in 20m of water depth indicating shallow sand over peat and clay.
Jetting through sand over rock to locate suitable anchor holding position for barge during cable haul back operations.
Removal of pilot hole drill motor ready for back reaming operations.
Diver installing back reamer ready for back reaming of pilot hole
Diver connecting HDPE pulling head to drill string haul back clevis.
Power cable floating for 600m from seabed lay point to Silver beach Joint Bay.
Silver Beach Joint Bay
Cable in alignment ready for sinking through seagrass sensitive area Silver Beach.
Cable being floated into Silver Beach joint bay
Diveco cable handling vessel ÔUndauntedÕ maintaining Omega configuration during floating of cable into Silver Beach.
Diver carrying out remedial work on cable bundle to bury cables to 1.5m of depth.
Trefoil cables being buried near Rocky Shoals (Watts Reef)