India Today, on Jan 9, 2021 carries the Map Below on 3 Unmanned Underwater Vehicle (UUV) sightings/captures.
Looking at the Map is:
UUV 1. - In March 2019, a UUV was found North of Singapore and East of Malaysia on the approaches to the Strait of Malacca.
UUV 2. - The next UUV was found on January 2020 near the Sunda Islands in the central Indonesian Archipelago, and
UUV 3. - The much reported UUV capture near Selayar Island, Indonesia, was on December 20, 2020.
MAP showing locations of the 3 Chinese(?) or other country's UUVs. (Map courtesy OSINT and Google Earth).
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COMMENT
Most news agencies, and even specialist websites, have provided very geographically incorrect/ignorant and alarmist reports on the multiple UUV sightings. Such UUVs may not necessarily be of Chinese origin.
Probably the most helpful source is the map above.