Passcode in the Tiltren tomb?

[Nitroglycerine]

Guess I'm looking for a spoiler here 😅
Did I miss something?
I didn't see any way to determine the passcode for entering the (presumably final) room.

Or do you have to come back in the future?

[CCK]

Spoiler:
There are hints on the walls at different rooms. Sometimes hints are on the ground as well

[Evigmae]

Each tomb has 3 symbols hidden somewhere, each symbol has a color. Then notice the spinning lock on the door has a color on each cylinder. Just add the symbol of the matching color in there and it'll open.
Some are on the floor, some on the walls, and some are hidden behind objects so make sure you move the camera around a bit to check behind things.

[Nitroglycerine]

Thanks, I'll take a look one more time
I saw 2 of the 3, but must have missed the 3rd symbol!