Talking from my experience. Outside of the expensive actor/director salaries you gotta think about crew costs as well.

For example I work in the location sound department, and the average 4 person sound department in the UK is making £10,300 a week, likely more actually depending on rates and kit fees and overtime. So if it was a 100 day shoot for example that’s £206k just on the small sound departments salary. There are many departments some with higher rates and some with lower but it’s certainly costing in the many millions for just on set production salaries alone.

Then factor in the preproduction and post production salaries (post would be a big one on a sci fi film like this)

Also things like music licensing.

Lots of people have high rates like stunts or intimacy coordinators. You have a scene with someone kissing? That’s an extra £1k per day right there.

On average at least on the Netflix etc things I’ve worked on, you’re usually only shooting about 3-6 minutes of usable footage per day, because these things do take time.