We are still carrying out essential works on assets with additional safety measures.

Underwater Dive & Topography Surveys

Experienced, Trained & Certified Teams

We supply qualified divers to undertake underwater surveys and have suitably qualified surveyors to carry out a variety of topographical surveys

Henderson Thomas Associates (HTA) can carry out Inspections, Investigations and Testing to structures that require the use of a boat and or pontoon to safely access any particular element.

These include:

  • Underwater / Dive
    Supply of dive team to ascertain inspection details
  • Topographic Surveys
    Bed profile surveys related back to datum points on bridges for scour assessment
  • Scour Assessment
    Probing and underwater inspections for scour

HTA working on Scour under water


Water related projects are multi-discipled and need multi-skilled staff
requiring an array of equipment
HTA can provide the full service saving you time money and hassle

Be site safe

Ensure the project is carried out safely with our; DEFRA 2 (swift water & flood first responders SFR) and RYA 2 Speed Boat Handlers

HTA are also able to supply all relevant safety and rescue equipment necessary for working above water and we can supply an underwater inspection / Topographic (TOPO) services if so required for structures adjacent to rivers and coastal areas.


Get the complete Service

We cover everything required for 'Working on or Near Water' Projects


Your hiring Check List

Safety is paramount when working on or near water and best practice should always be adhered to, reducing risk and liability.

Therefore, before you consider contracting a company check they have the following:

  • 1. Pontoon Training – Incorrect set-up can result in danger to engineers life.
  • 2. Water Awareness Training (DEFRA) – To facilitate land based / wading safe rescue in an emergency.
  • 3. Safety Boat Handler (RYA Speed Boat Level 2) – Safe deep water rescue.
  • 4. Engineers First Aid (Level 2) Trained – Resuscitation skills are more likely to be required when water is involved.

Still got questions? Give us a call!

Take advantage of our Open Door Policy

Even if you do not end up using HTA we are happy to advise on the best course of action for the outcome you wish to achieve.

It is impossible for one company to carry out every project, however we can share our expertise far and wide.

Call: 01707 657 212 or Email: testing@hendersonthomas.co.uk