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Eleven stations, which belong to the International Monitoring System (IMS) hydroacoustic network, are specifically designed for detecting underwater nuclear test explosions. Nearly half of the hydroacoustic network consists of T-phase stations near the shorelines, where depth increases rapidly. This allows for minimising signal attenuation. T-phase stations measure seismic waves converted from hydroacoustic signals along the coastal slope. Hydroacoustic stations can detect underwater explosions at large distances; however, the IMS hydroacoustic network does not cover some areas due to land blockages of the propagation path. In addition to hydroacoustic stations, converted hydroacoustic signals from seismo-acoustic events can be identified on seismic and infrasound stations. The current configuration of International Data Centre T-phase station data processing allows for estimating signal arrival time; however, some other parameters (i.e. azimuth) are not calculated. Hydroacoustic phases recorded at seismic arrays and infrasound stations exhibit expected azimuth estimates. This study also shows that the infrasound and seismic networks may detect hydroacoustic signals in regions not covered by the IMS hydroacoustic network.