People,
The question is, did it come from outer space, or did it rise up from some underground-river type of opening at the lake bottom?
https://rense.com/general96/chile-ufo.php
UFOs do fly underwater to cavern world cities or bases. Just take a look at "Underground Abducttions: Whereto?
http://www.holloworbs.com/underground_abductions.htm
You can read more, but just the third paragrapgh explains it well.
Cheers!