Clear, Reliable Assessments of Critical Infrastructure Below the Surface
Brennan provides underwater inspections for dams, bridges, piers, terminals, intakes, outfalls, pipelines, docks, energy facilities, and other water-based infrastructure.
Built To See, Understand, and Document What Others Cannot Underwater Inspection Services
Every structure is different below the surface. Water depth, visibility, current, sediment, debris, access limitations, structural age, and operating conditions can all affect what needs to be inspected and how the work should be performed.
Brennan is built for that complexity.
Our inspection divers are trained commercial divers with experience assessing complex water-based infrastructure, operating underwater imaging technology, and using ROVs to support inspection planning and documentation. Brennan’s underwater inspection work is designed to meet high standards for safety, quality, and performance while giving owners and engineers the information they need to act with confidence.
Detailed Inspection Support for Planning, Maintenance, Compliance, and Repair Areas of Focus
Brennan provides underwater inspection services that help clients evaluate existing conditions, understand risk, document changes, plan repairs, verify completed work, and support regulatory requirements.
Condition Assessments for Water-Based Assets Critical Infrastructure Inspections
Underwater inspections help owners understand the condition of structures and systems that cannot be fully evaluated from above the waterline. Brennan’s inspection teams assess submerged components, identify visible deterioration, document areas of concern, and provide practical information that supports maintenance and repair planning.
Key Capabilities
- Underwater structural inspections
- Dam inspections
- Bridge inspections
- Pier and dock inspections
- Terminal inspections
- Intake and outfall inspections
- Pipeline inspections
- Industrial dock inspections
- Energy facility inspections
- Marine structure condition assessments
- Photo and video documentation
- Inspection reports and recommendations
Inspection Detail Matched To the Structure & Scope ASME Certified Inspection Levels
Different projects require different levels of inspection detail. Brennan supports ASME inspection levels ranging from general visual review to highly detailed assessments that may include cleaning, specific measurements, non-destructive testing, and destructive testing when required.
Level I Inspection
Visual and tactile inspection with general measurements and observations. This level helps provide a broad understanding of underwater conditions and identify areas that may require closer evaluation.
Level II Inspection
Detailed inspection that may include non-destructive testing, ultrasonic thickness measurements, intermittent cleaning, and focused measurements. This level is useful when owners and engineers need more specific data to support maintenance or repair decisions.
Level III Inspection
Highly detailed inspection that may include extensive cleaning, specific measurements, and destructive testing when needed. This level supports deeper evaluation of critical components, suspected defects, or structures requiring detailed engineering review.
Key Capabilities
- ASME Level I inspections
- ASME Level II inspections
- ASME Level III inspections
- Visual and tactile inspection
- General and focused measurements
- Non-destructive testing
- Ultrasonic thickness measurements
- Intermittent or extensive cleaning
- Destructive testing support when required
- Engineering-focused documentation
Reports That Help Owners Plan the Next Step Maintenance Planning & Regulatory Compliance
Underwater inspection findings are most valuable when they are clear, organized, and useful. Brennan provides detailed reports that help clients understand what was inspected, what was found, where areas of concern are located, and how those findings may affect maintenance, repair, or compliance planning.
Inspection Deliverables May Support
- Maintenance planning
- Repair planning
- Regulatory compliance
- Asset management
- Capital planning
- Risk assessment
- Engineering review
- Condition tracking over time
- Post-construction verification
- Emergency response documentation
Better Insight Through ROVs, Survey, Imaging, and 3D Modeling Technology-Assisted Inspections
Brennan uses technology to improve inspection efficiency, safety, and accuracy. Depending on project needs, our teams may use ROVs, hydrographic survey, underwater imaging, 3D modeling, sonar, stereo camera photo and video documentation, and other tools to capture a clearer picture of submerged assets.
These technologies help clients gain useful information before, during, and after diver entry, supporting better planning and safer execution.
Key Capabilities
- ROV inspections
- Stereo cameras
- Hydrographic survey
- 3D modeling
- Underwater imaging
- Sonar-assisted inspection
- Acoustic imaging support
- Photo and video documentation
- Pre-dive planning support
- Asset condition monitoring
- Construction and repair verification
Remote Inspection Support for Difficult and Safety-Critical Environments ROV-Supported Inspections
ROVs can inspect areas that are difficult, unsafe, confined, low visibility, or inefficient for diver-only work. Brennan operates our ROVs to support pre-dive planning, confined space inspections, asset condition monitoring, and underwater documentation.
ROVs can also help reduce risk by gathering preliminary information before divers enter the water.
Key Capabilities
- ROV inspections
- Pre-dive planning
- Confined space inspection support
- Asset condition monitoring
- Stereo camera video documentation
- Sonar imaging support
- Difficult-access inspections
- Diver-support and diver-alternative inspection options
Assessments for Water-Control & Energy Infrastructure Underwater Inspections for Dams & Hydropower
Dams and hydropower facilities include submerged structures that require careful inspection to maintain safe and reliable operation. Brennan supports inspections of spillways, intakes, trash racks, gates, tailraces, penstocks, powerhouse structures, and related water-control components.
Key Capabilities
- Dam inspections
- FERC 12 inspections
- Hydroelectric facility inspections
- Intake and trash rack inspections
- Gate and bulkhead inspections
- Spillway and tailrace assessments
- Penstock support
- Underwater concrete assessments
- Scour and erosion documentation
- Repair planning support
Below-Water Support for Transportation & Waterfront Assets Underwater Inspections for Bridges & Marine Structures
Bridges, piers, docks, terminals, and other marine structures are exposed to water, ice, debris, scour, vessel activity, corrosion, and long-term wear. Brennan provides underwater inspection services that help owners identify issues early and plan appropriate repairs.
Key Capabilities
- Bridge pier inspections
- Abutment inspections
- Dock and pier inspections
- Terminal inspections
- Industrial waterfront inspections
- Scour assessments
- Pile inspections
- Fender and dolphin inspections
- Underwater concrete and steel assessments
- Repair recommendations
Condition Information for Critical Flow Systems Underwater Inspections for Intakes, Outfalls, and Pipelines
Intakes, outfalls, pipelines, pump stations, cooling systems, and discharge structures are essential to facility performance. Brennan provides underwater inspections that help facility teams evaluate condition, debris buildup, structural concerns, and maintenance needs.
Key Capabilities
- Intake inspections
- Outfall inspections
- FERC 12 inspections
- Pipeline inspections
- Pump station inspection support
- Cooling system inspections
- Traveling water screen support
- Valve and seal inspection support
- Discharge structure inspections
- Debris and sediment documentation
- Maintenance planning support
Divers, Technology, and Deliverables Working Together Why Brennan for Underwater Inspections?
Underwater inspections require more than getting eyes on a structure. They require trained divers, the right technology, disciplined safety practices, and deliverables that clearly support the client’s next decision.
Brennan brings commercial diving, underwater imaging, ROVs, hydrographic survey, 3D modeling, marine construction, and infrastructure repair expertise together under one team. That means our inspection crews understand not only how to identify concerns, but also how those findings may translate into repair, construction, or maintenance work.
What Sets Brennan Apart
- One of the largest, highly trained ADCI-certified union dive teams in the country
- Award-winning safety performance in safety-critical environments
- Collaborative, honest delivery with owners, engineers, suppliers, contractors, regulators, and stakeholders
- Post-dive-school training and advanced training in Brennan’s own dive tank
- ASME Level I, Level II, and Level III inspection capabilities
- Underwater inspections that support maintenance planning and regulatory compliance
- ROVs, hydrographic survey, 3D modeling, and industry-specific technology
- Experience with dams, bridges, piers, terminals, industrial docks, intakes, outfalls, pipelines, and energy infrastructure all under one team
- Detailed reports that highlight areas of concern
Whether you need a routine condition assessment, ASME inspection, ROV-supported inspection, dam inspection, bridge inspection, intake or outfall evaluation, pipeline assessment, or detailed documentation for regulatory compliance, Brennan has the divers, technology, and experience to help.
