Home/Services

What services
can Subsea100
cover?

We deliver comprehensive marine geophysical surveys and advanced subsea solutions to support informed decision-making across offshore projects.

Each service below is something we run with our own team — from acquisition through to clean, usable deliverables.

Index

Our
services.

01Subsea construction support↓ 02Drilling support with work-class ROV↓ 03Rig positioning and well spudding↓ 04Intervention and ROV tooling services↓ 05Installation, repairs & maintenance (IRM)↓ 06Pipeline inspection with AUV / HAUV / ROV↓ 07Tank cleaning and inspection↓ 08UWILD, hull inspection & photogrammetry↓ 09Acoustic metrology & LiDAR metrology↓ 10Dimensional control & 3D laser scanning↓ 11Geophysical engineering survey↓ 122D/3D high-resolution seismic↓ 13Geotechnical & site investigation & EIA↓ 14Dive support and pipelaying support↓ 15Aerial survey and land survey↓ 16Rope access↓ 17Project management↓ 18Marine growth removal↓ 19Weather forecast↓ 20Mooring support services↓
§ 01 / Subsea construction support

Subsea construction
support.

Survey and positioning support through every phase of offshore construction — from pre-installation survey of the site to as-built verification of the finished structure.

  • Pre-installRoute and site survey ahead of installation
  • PositioningReal-time placement of structures and modules
  • MonitoringTouchdown and lay monitoring during installation
  • As-builtVerification survey and as-built documentation
Subsea structure prepared in the fabrication yard
Construction · structures
Subsea100 work-class ROV on deck before launch
Work-class ROV · drilling
§ 02 / Drilling support with work-class ROV

Drilling support with
work-class ROV.

Work-class ROV spreads supporting drilling campaigns — seabed clearance, wellhead and BOP monitoring, and intervention capability held on station for the length of the programme.

  • ClearanceSeabed and site clearance before spud
  • ObservationLive wellhead and BOP monitoring
  • InterventionHydraulic torque and override capability
  • StandbyROV spread on station through the campaign
§ 03 / Rig positioning and well spudding

Rig positioning and
well spudding.

Precise positioning of jack-ups, semi-submersibles and drilling units onto location, with approach monitoring, leg placement and independent verification of the spud point.

  • ApproachRig move planning and approach monitoring
  • PlacementLeg and spud-can positioning to tolerance
  • VerificationIndependent confirmation of final position
  • ClearanceSite clearance and debris survey
Jack-up rig on location with support vessel
Rig move · positioning
Subsea100 technician with subsea tooling and wellhead equipment
Tooling · intervention
§ 04 / Intervention and ROV tooling services

Intervention and
ROV tooling.

Subsea intervention with purpose-built ROV tooling — valve operation, torque work, cleaning and recovery tasks executed on the seabed and documented as they are done.

  • TorqueValve override and torque tool operation
  • ToolingPurpose-built skids and tooling packages
  • CleaningMarine growth removal and surface preparation
  • RecoveryDebris clearance and object recovery
§ 05 / Installation, repairs & maintenance (IRM)

Installation, repairs
& maintenance.

Inspection, repair and maintenance campaigns that keep subsea and topside assets in service — scheduled survey, anomaly tracking and the data to justify the next intervention.

  • InspectionScheduled and anomaly-driven inspection
  • RepairSurvey support to subsea and topside repair
  • IntegrityAnomaly tracking across campaign cycles
  • ReportingIntegrity data your engineers can act on
ROV spread rigged on deck for an IRM campaign
IRM · integrity
Hybrid AUV prepared for a pipeline inspection run
Pipeline · AUV & ROV
§ 06 / Pipeline inspection with AUV / HAUV / ROV

Pipeline inspection by
AUV, HAUV and ROV.

Pipeline and flowline inspection using the right vehicle for the job — autonomous, hybrid or work-class — returning route position, exposure, freespan and anode condition.

  • RouteAs-laid position and route verification
  • FreespanFreespan and exposure measurement
  • CathodicAnode condition and CP potential readings
  • ReportingKP-referenced findings and anomaly lists
§ 07 / Tank cleaning and inspection

Tank cleaning
and inspection.

Cleaning and internal inspection of tanks and confined spaces, carried out under controlled entry procedures and recorded in the detail class and compliance require.

  • CleaningTank and confined-space cleaning
  • InspectionInternal condition and coating survey
  • Confined spaceControlled entry under permit
  • RecordPhotographic and written condition record
Observation-class ROV used for tank and confined space inspection
Tanks · confined space
Underwater hull inspection in lieu of drydocking
UWILD · hull
§ 08 / UWILD, hull inspection & photogrammetry

UWILD, hull inspection
& photogrammetry.

Underwater inspection in lieu of drydocking, hull and niche-area survey, and photogrammetric modelling that turns survey imagery into measurable three-dimensional records.

  • UWILDClass-compliant in-water survey
  • HullHull, rudder, propeller and niche areas
  • PhotogrammetryMeasurable 3D models from survey imagery
  • ClassDocumentation prepared for class attendance
§ 09 / Acoustic metrology & LiDAR metrology

Acoustic and LiDAR
metrology.

Subsea metrology by acoustic or LiDAR method, producing the spool and jumper measurements fabrication can build to and install first time.

  • AcousticLong-baseline acoustic metrology
  • LiDARSubsea laser metrology for close-range work
  • SpoolsSpool and jumper fabrication dimensions
  • ToleranceResults reported with stated uncertainty
Acoustic metrology equipment prepared for a subsea measurement
Metrology · spools
Subsea100 surveyors running a 3D laser scan in the fabrication yard
DimCon · laser scan
§ 10 / Dimensional control & 3D laser scanning

Dimensional control
& 3D laser scanning.

Topside dimensional control and laser scanning — capturing structures as they actually are, so tie-ins, modules and retrofits fit on first presentation.

  • ScanningHigh-density 3D laser scan capture
  • ControlDimensional control networks and checks
  • ModellingPoint cloud registration and as-built models
  • Fit-upTie-in and retrofit fit verification
§ 11 / Geophysical engineering survey

Geophysical
engineering survey.

Geophysical survey aimed at engineering decisions — bathymetry, seabed imaging and shallow sub-surface data, interpreted for route selection and foundation design.

  • BathymetryMultibeam acquisition and processing
  • ImagingSide-scan sonar seabed classification
  • Sub-bottomShallow stratigraphy and hazard screening
  • ChartsEngineering charts and route reports
Sub-bottom profiler record showing shallow seabed stratigraphy
Geophysical · sub-bottom
High-resolution seismic section from a site survey
Seismic · high-resolution
§ 12 / 2D/3D high-resolution seismic

2D/3D high-resolution
seismic.

High-resolution seismic acquisition and processing that resolves shallow structure and geohazards in the detail engineering decisions actually require.

  • Acquisition2D and 3D high-resolution acquisition
  • ProcessingIn-house processing and quality control
  • HazardsShallow gas and geohazard identification
  • InterpretationHorizons and structure tied to engineering
§ 13 / Geotechnical & site investigation & EIA

Geotechnical, site
investigation & EIA.

Sampling, in-situ testing and environmental assessment — establishing what the ground will carry, and what the project will affect once it is there.

  • SamplingBorehole and vibrocore sampling
  • In-situCPT and in-situ strength testing
  • LaboratoryClassification and strength testing
  • EIAEnvironmental baseline and impact assessment
Geotechnical sampling equipment on deck
Geotechnical · EIA
Night deck operations launching a subsea spread
Dive & pipelay
§ 14 / Dive support and pipelaying support

Dive support and
pipelaying support.

Survey and positioning support to diving and pipelay operations — keeping divers, spreads and the lay vessel on position and on route from first joint to final tie-in.

  • Dive supportPositioning and tracking for dive spreads
  • PipelayLay route control and touchdown monitoring
  • NavigationVessel navigation and spread positioning
  • As-laidAs-laid survey on completion
§ 15 / Aerial survey and land survey

Aerial survey and
land survey.

Above the waterline: aerial mapping and topographic land survey, tied into the same control framework as the offshore data so every dataset lines up.

  • AerialAerial and UAV mapping and orthophotos
  • TopographicTopographic and cadastral land survey
  • ControlGNSS control networks and benchmarks
  • IntegrationCommon datum with offshore datasets
Aerial survey view of a coastal facility
Aerial · land
Subsea100 rope access technician inspecting a jetty pile
Rope access · IRM
§ 16 / Rope access

Rope access.

Rope-access teams reaching structures that staging cannot — jetty piles, risers, flare booms and splash-zone steel — without shutting the asset down to do it.

  • AccessRope-access teams for difficult structures
  • InspectionClose visual and NDT at height or depth
  • Splash zoneRiser and splash-zone steel inspection
  • UptimeNo staging and no production shutdown
§ 17 / Project management

Project management.

One team accountable from scoping through to final deliverable — planning, offshore execution, client reporting and close-out held together by the same people.

  • PlanningScope, method statements and mobilisation
  • ExecutionOffshore supervision and daily reporting
  • HSEProcedures, permits and safety management
  • Close-outFinal deliverables and project close-out
Subsea100 crew reviewing survey data offshore
Project management
§ 18 / Marine growth removal

Marine growth
removal.

Cleaning of hulls, intakes, risers and subsea structures to remove marine growth, restoring flow, visibility and inspection access before survey or repair work begins.

  • Hull cleaningROV and diver-operated hull and niche cleaning
  • IntakesSea chest and intake clearance
  • RisersRiser and subsea structure growth removal
  • Pre-surveyCleaning ahead of inspection or metrology
Subsea100-badged ROV fitted with cleaning and intervention tooling
Marine growth · cleaning
Subsea100 survey team working on deck under open sky
Weather · forecasting
§ 19 / Weather forecast

Weather
forecast.

Met-ocean forecasting and weather routing that keeps offshore operations informed, with go/no-go windows, swell and wind outlooks tracked through every phase of a campaign.

  • ForecastingMet-ocean and weather window forecasting
  • RoutingWeather routing for vessel passages
  • MonitoringContinuous tracking through operations
  • AdvisoryGo/no-go guidance for weather-sensitive work
§ 20 / Mooring support services

Mooring support
services.

Mooring analysis and support for vessels, barges and floating assets, covering safe approach, line handling and station-keeping from arrival to departure.

  • AnalysisMooring line and station-keeping analysis
  • Line handlingSupport to mooring and towing operations
  • MonitoringLine tension and position monitoring
  • ApproachSafe approach and berthing support
FPSO deck with mooring and riser piping at sea
Mooring · FPSO
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subsea
project with us.

Whether you're scoping a survey, planning an inspection or thinking ahead to construction — talk to our team and we'll help you figure out what you actually need.

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