Nguyen Thi Nga, Tran Quang Giang and Vu Hai Lang 2025. Underwater communication system for shallow water environments using FSK modulation. Journal of Military Science and Technology. IITE (Oct. 2025), 107–114. DOI:https://doi.org/10.54939/1859-1043.j.mst.IITE.2025.107-114.