Mid-ocean ridges represent divergent plate boundaries characterized by the interaction of volcanic and tectonic processes, resulting in the creation of a new ocean floor. These complex interactions lead to the occurrence of numerous low-magnitude earthquakes (M less than 4), which often go unnoticed by terrestrial seismic networks due to the rapid attenuation of seismic waves within the Earth’s crust. But, these earthquakes generate T-waves with frequencies of up to 60 Hz in the water column from the conversion of seismic waves into low-frequency hydroacoustic waves at the seafloor which propagate over large distances (several thousands of km) with little attenuation through an acoustic waveguide known as the sound fixing and ranging (SOFAR) channel. The OHASISBIO and IMS-CTBTO networks of hydrophones, designed to record these T-waves in the Indian Ocean, encompass three mid-ocean ridges with contrasted spreading rates: the ultraslow spreading Southwest Indian Ridge (SWIR; 14 mm/yr), the slow spreading Central Indian Ridge (CIR; 40 mm/yr), and the intermediate spreading Southeast Indian Ridge (SEIR; 60 mm/yr) which converge at Rodrigues Triple Junction (RTJ). In this depository, we have put hydroacoustic catalogs of three swarms detected along the Southwest Indian Ridge between 2016 and 2018. These swarms are located near the Novara transofrm fault, melville transofrm fault and at segment 4