Been 20+ years since I drove down that thing. It is access to the power plant level. Could be quite exciting if you met a tour bus while driving a dually utility body truck. It is supposedly 22 feet wide but two 8 foot wide vehicles plus mirrors made it seem plenty close. Don’t know if busses still have access, likely not according to the below from the USBR site about the dam.
https://www.usbr.gov/uc/rm/crsp/gc/#vehicle
There is a two mile (3.2-kilometer) dam-access tunnel through the east wall of Glen Canyon that begins on the mesa. The tunnel was blasted prior to construction of Glen Canyon Dam in order to transport heavy equipment and supplies to the canyon floor. The holes in the wall are adits or “windows” that were initially blasted out for the purpose of allowing excavated rock to be dumped to the river banks below. The adits now allow for circulation of air in the tunnel. The dam-access tunnel is not open to the public.
Enjoy your trip and be careful.
PO
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