Im still wondering and i didn't see anyone mentioning it, in the trailer when JDW is with the gas mask you can see in the reflection Robert Pattinson just walking casually in what it seems to be like the place from the leaked set photos in the desert, these pillars look like them, maybe there is a some kind of portal to that set location ? https://youtu.be/LdOM0x0XDMo?t=86
The reason you haven’t seen someone mention it is because we’ve seen it in the teaser trailer. People mentioned it then.
Tenet has the most potential to be a massive hit for a Nolan film since Inception, in terms of money and cultural impact. In 2010 Inception was talked about everywhereee in large part because it had such a fascinating "hook." Tenet's reverse time element could maybe be as "cool" as Inception's dream levels. This trailer does a great job at teasing its hook.
Are we 100% certain it's Pattinson saying, "what the hell happened here?" He's behind a wall and his voice is pretty clean, and to me that doesn't really sound like him. Sounds like someone in the same room as JDW.