(www.bbc.com)
tl;dr: very passionate young man develops a special interest in the Thylacine (Tasmanian Tiger), and becomes convinced (not without some evidence) that it might still be alive in Western Papua. So he spends two and a half years preparing to Indiana Jones it into the mountains of Western Papua, and the video ends with him saying "I went". Cut to black. No part 2 was ever posted.
Damn, I really want to know how that story finishes. (I fear that "I went" actually meant "I'm going right now", with the intention that he would post part 2 upon his return. Which appears not to have happened.)
https://www.youtube.com/watch?v=ZWp5904RkJY
This is an area where raising the West Papua can give you 15 years in prison.
The situation in West Papua is essentially one of the least recognized humanitarian and ecological tragedies slowly happening right under our noses.
The US currently has 8,133.5 metric tons of gold which is more than the next 4 combined (Germany, Italy, France, and China). About 1,700 metric tonnes (out of an estimated total 4,720) has been extracted from West Papua by the US
Does this makes sense for an English speaker ?
On the British elegance: in British English one could of course use "thought to be extinct" and in these kinds of structures it has become common as a stylistic touch to drop the helping infinitive, "to be", considering it implied.
"Possum considered extinct for 6,000 years"