Applied Physical Sciences Corp., Groton, Connecticut, was awarded a $15,272,429 modification (P00012) to cost-plus-fixed-fee contract HR0011-20-C-0100 for Phase 3D of a research project for undersea sensing systems. The modification brings the total cumulative face value of the contract to $71,040,762 from $55,768,333. Work will be performed in Groton, Connecticut (57%); Arlington, Virginia (15%); Pawcatuck, Connecticut (15%); Orange, California (8%); and Concord, Massachusetts (5%), with an expected completion date of October 2024. Fiscal 2023 research, development, test, and engineering funds in the amount of $15,272,429, are being obligated at time of modification award. This contract was a competitive acquisition in accordance with original broad agency announcement HR001117S0034. The Defense Advanced Research Projects Agency, Arlington, Virginia, is the contracting activity.