The tomb tour is for anyone in the museum. The schedule of tours is posted and you just line up at the tomb before the start of the tour you want. If it's busy, it's first come first serve. You don't have have to be in a group tour to go. I'm not sure about Spanish tours, though.
You can walk around on your own. There is tours in other languages with headphones
No Spanish speaking tour. Perhaps a request could be made in advance. I think you can go through the tomb on your own, (self-guided) at least, I did.
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