August 7th, 2026
PHILADELPHIA
Co-sponsors Investment in Specialized Underwater Diving Services Business
Graham Capital Investments (“GCI”) is pleased to announce its partnership with Crescentia Capital (“Crescentia”) in its strategic investment in Underwater Construction Company LLC (“UCC”), a leading provider of specialized underwater diving services to the nuclear and hydroelectric power generation, U.S. Navy, municipal water infrastructure, and industrial end markets.
Founded in 1969, UCC has grown into one of the most technically capable and broadly credentialed underwater services businesses in the United States. Headquartered in Essex, Connecticut, the Company operates from seven regional offices spanning the Northeast, Mid-Atlantic, Midwest, and South. With a workforce of more than 225 certified commercial divers, UCC delivers inspection, cleaning, repair, and maintenance services for mission-critical infrastructure across the country, complemented by specialized capabilities including underwater welding, protective coatings, and remotely operated vehicle (“ROV”) operations.
“UCC reflects exactly the kind of opportunity in which GCI seeks to participate – a market leading business with deep technical capabilities, in partnership with a strong and experienced sponsor. We are proud to partner with Crescentia and the UCC team to support the Company’s next phase of growth.” said Chris Lawler, Managing Partner at GCI.
GCI will support Crescentia’s initiative to build a national platform in specialized underwater services by bringing capital and resources to help fuel organic growth opportunities and strategic acquisitions. Through the co-sponsorship model, GCI brings institutional underwriting, consultative capabilities, and access to operational resources to accelerate the company’s growth plan.
About Underwater Construction Company LLC
Founded in 1969, Underwater Construction Company LLC is a leading provider of specialized underwater diving services across the United States. UCC pioneered commercial nuclear diving in the early 1970s and has grown into one of the largest nuclear diving companies in the world. UCC delivers a comprehensive suite of services, including inspection, cleaning, repair and maintenance, underwater welding, specialty coatings, carbon fiber structural wrapping, and ROV operations, to clients across the nuclear and hydroelectric power, defense, municipal water utility, and industrial sectors. For more information, please visit: www.uccdive.com.
About GCI
GCI is a private equity platform that primarily focuses on making investments alongside independent and emerging sponsors in the North American lower middle market through (i) co-sponsorships, (ii) select influential co-investments, and (iii) secondary transactions. Through a focused and customized model, GCI seeks to combine its deep market knowledge, extensive network, and operational resources to originate unique investment opportunities and drive value pre- and post-close. For more information, please visit: www.gci-graham.com.
About Crescentia Capital
Crescentia Capital, the equity buyout business of Calvert Street Investment Partners, focuses primarily on control investments in companies providing critical or essential services to the industrial and infrastructure end markets. Crescentia has been partnering with families and owner-operators to accelerate growth and drive value creation in lower middle-market companies since 1995. Crescentia collaborates closely with its operating partners and management teams, employing a disciplined investment approach that aligns our interests and commitment to the strategic growth plan. Collectively, the investment professionals have invested more than $675 million of capital (including co-investment amounts) across 70+ companies. For more information, please visit: www.crescentiacapital.com.
Legal Disclaimer
This press release is for informational purposes and is not an offer to sell, or a solicitation of an offer to buy, securities in the United States or elsewhere. GCI is not utilizing this release to provide investment or other advice, and no information disclosed herein is to be relied upon for the purpose of making investment decisions. Past performance does not guarantee future results and any transactions described are included as representative transactions and are not necessarily reflective of overall performance. It should not be assumed that any investment described herein was or will be profitable. There can be no assurance that historical trends will continue.
