Underwater Construction Services

J.F. Brennan Company divers are experienced; underwater construction specialists. Whether it is nuclear diving or repairing marine-based infrastructure, our divers have the right training and equipment to complete a high-quality project. Backed by one of the largest fleets of inland marine construction equipment in the United States, there is no project too large or too small that we cannot accomplish.

Brennan is approved to perform safety-related work in accordance with ASME NQA-1 (2022), 10 CFR 50 Appendix B, and 10 CFR Part 21. We are a proud member of the Association of Dive Contractors International (ADCI), and all of our commercial divers are certified. We mobilize anywhere in the continental United States promptly while maintaining competitive rates.

Our divers repair underwater concrete, steel, and other structures in near-zero-visibility conditions. We also have the ability to perform cold-water dives, hot-water dives, contaminated environment dives, and deep dives that require a decompression chamber.

Our divers excel in underwater concrete placement. This includes preplaced aggregate concrete, cast-in-place, and precast concrete. Through the use of several types of formwork, Brennan has successfully repaired ice-damaged, degraded, eroded, and broken concrete concealed below the surface of the water. We are also able to repair underwater steel structures. Specialty equipment such as underwater saws, torches, and welders enable our trained divers to remove or repair steel structures such as pipes, gate structures, trash racks, outfalls, etc.