I have seen videos and photos of this submarine several times over the years. It’s on my Bucket List.
The Find of a Lifetime: https://www.youtube.com/watch?v=r5jUHCDF3MM (about 3:08 minutes long)
It is this one: https://en.wikipedia.org/wiki/Sub_Marine_Explorer. You can view the location on Google Maps: https://www.google.com/maps/place/Wreck+of+the+Sub+Marine+Explorerfirstname.lastname@example.org,-78.84889,949m/data=!3m1!1e3!4m13!1m7!3m6!1s0x8e52e32ee9706f6d:0x5cec375254ae6c1d!2sSan+Telmo+Island!3b1!8m2!3d8.2751023!4d-78.8467579!3m4!1s0x8e52e329b9a47ec9:0x4f5f634db5a7eb7c!8m2!3d8.2815791!4d-78.8459051.
Atlas Obscura: https://www.atlasobscura.com/places/wreck-of-the-sub-marine-explorer
Compass Cultura: https://compasscultura.com/the-pearl-island-submarine/