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Diving & Subsurface

The SMS Group has, in-house, a dedicated, experienced and capable Diving and Sub-Surface Engineering team. With plant, equipment, and SQEP based in Lowestoft, Dover, Portsmouth and Bristol the business covers works on a planned and emergency basis across the following regions: East Anglia, the Thames, South East and South West. These ‘hubs’ are fully resourced and available to respond immediately.

Our core capabilities

  • Pre-purchase Surveys; hull inspection, underwater fitting and machinery. Mitigating the need the dock the vessel
  • MPI (magnetic particle inspection) testing; and Ultrasonic testing
  • Crack detection and definition
  • Planned and emergency diving support
  • Cathodic protection survey and renewal
  • In-water surveys, repairs and installations
  • Bespoke plant hire and heavy engineering equipment; barges, jack-ups, pontoons, safety and workboats
  • Propeller clearing, fouled running gear and underwater situation assessments
  • Salvage and damage assessment
  • Class extension inspections
  • Utilities infrastructure; repair and maintenance
  • Power stations, reservoirs and outflows
  • ROV deployment and ‘live’ data inspections
  • Contaminated water diving
  • CSWIP accredited divers to 3.1 and 3.2 levels
  • Lock gate, dock gates and cofferdam (manufacturing and installing)

Our engineering capabilities

  • Underwater welding and fabrication
  • Underwater construction
  • Sub-Surface mechanical engineering
  • Underwater cutting utilising BROCO equipment
  • Underwater lifting and recovery; to include search and complex lift plans



  • Equipment and resource in four key hubs
  • Lowestoft, Dover, Bristol, Plymouth
  • 24/7 support; both planned and emergency works

Our state-of-the-art ROV capabilities

  • Rapid response
  • Full HD Camera footage
  • MPI NDT attachments
  • Diver assistance
  • Dive to depths of up to 300m
  • Search, recovery and locate with the additional use of sonar attachments
  • Easy access in to smaller culverts, sewage and water plants

Click here to download our PDF


Where next?

Electrical Engineering

Offering marine grade electrical engineering to our defence, cruise and commercial customers we’re pleased to offer survey, repair, renew, and installations solutions, throughout our network.

Energy & Renewables

The renewable and nuclear energy markets are key to The SMS Group; with support for this sector being spearheaded by our team in Lowestoft; CTV, WFSV and OSV support, welding and manufacturing.

Commercial Ship Repair

The SMS Group has commercial ship repair and marine grade manufacturing hubs in Lowestoft, Southampton and Avonmouth; covering the South East and South West of the United Kingdom.

Welding, Fabrication & Pipework

Heavy marine engineering is big part of our service offering; marine grade manufacturing and ship systems are front and centre of The SMS Group’s core capabilities.