The Department of Defense, through the Naval Surface Warfare Center Carderock Division (NSWCCD), is seeking to award a firm-fixed-price contract for Maritime Survivability Library (MSL) Software Engineering and Support Services to Thornton Tomasetti on a sole-source basis. The contract aims to continue the development and enhancement of the MSL software, which includes integrating it with other maritime lethality tools and providing associated engineering services. This software is crucial for improving prediction capabilities and developing algorithms that support maritime operations. Interested parties should direct inquiries to Tracy L. McDonough at tracy.l.mcdonough2.civ@us.navy.mil, with responses due by October 29, 2025, for a contract period running from November 1, 2025, to October 31, 2026.