DivingCo-Header

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:

pic-Botany Bay cable project

Cable barge Steel Hauler loaded with cable ready for deployment to site.

pic-Botany Bay cable project

Seabed probing with 6m LP pressure jet in 20m of water depth indicating shallow sand over peat and clay.

pic-Botany Bay cable project

Jetting through sand over rock to locate suitable anchor holding position for barge during cable haul back operations.

pic-Botany Bay cable project

Removal of pilot hole drill motor ready for back reaming operations.

pic-Botany Bay cable project

Diver installing back reamer ready for back reaming of pilot hole

pic-Botany Bay cable project

Diver connecting HDPE pulling head to drill string haul back clevis.

pic-Botany Bay cable project

Power cable floating for 600m from seabed lay point to Silver beach Joint Bay.

pic-Botany Bay cable project

Silver Beach Joint Bay

pic-Botany Bay cable project

Cable in alignment ready for sinking through seagrass sensitive area Silver Beach.

pic-Botany Bay cable project

Cable being floated into Silver Beach joint bay

pic-Botany Bay cable project

Diveco cable handling vessel ‘Undaunted’ maintaining Omega configuration during floating of cable into Silver Beach.

pic-Botany Bay cable project

Diver carrying out remedial work on cable bundle to bury cables to 1.5m of depth.

pic-Botany Bay cable project

Trefoil cables being buried near Rocky Shoals (Watts Reef)