SubCom Decisive

SubCom Decisive is one of the roughly sixty cable ships worldwide that keep the internet alive — laying new submarine cables and repairing broken ones, sailing for SubCom.

Specifications

OperatorSubCom
Roleboth
FlagMarshall Islands
Built2002
Length × beam139.1 m × 21 m
Gross tonnage12,184
Cable capacity5,465.5 tonnes
Crew80
DP classDP2 (ABS +DPS-2)

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Overview

SubCom Decisive is a dual-purpose cable ship — capable of laying entirely new undersea cable systems and responding to faults on cables already in service. Built in 2002 and registered under the Marshall Islands flag, the vessel measures 139. 1 metres in length with a 21-metre beam and a gross tonnage of 12,184. Cable is loaded into the ship's holds in continuous coils; Decisive carries up to 5,465.

5 tonnes of it, enough for long transoceanic runs. Eighty crew and technicians can be accommodated aboard.

Laying and Repair Capability

The ship's cable-handling system centres on a 16-tonne linear engine — a powered track mechanism that grips and controls cable tension as it feeds over the stern — supported by two 4. 0-metre drum engines for managing slack and storing shorter cable lengths. At the burial end, Decisive operates a sea plough configurable for either 1.

5-metre or 3-metre burial depth, pressing the cable below the seabed to protect it from fishing gear and anchors. Where ploughing is impractical, a cable-trenching remotely operated vehicle (ROV) rated to 2,500 metres takes over, cutting a trench and laying cable on the seafloor without requiring a diver.

Positioning and Station-Keeping

Precise work on a cable requires the ship to hold its position without anchoring, which would risk damaging the very infrastructure below. Decisive carries a DP2 dynamic positioning system — certified to ABS +DPS-2 standard — meaning it uses GPS, thrust and computer control to stay on station automatically, with a redundant backup in case of primary system failure.

Fleet Context

Within SubCom's global fleet, Decisive sits as a workhorse for both greenfield projects and maintenance contracts. Its base port and primary operating zone are not publicly documented, reflecting the itinerant nature of cable-ship operations — vessels of this class follow the work wherever it arises across ocean basins.