My hospital's policy with twins was, with two vertex presentations, labor & pushing in one of the regular labor/birthing suites was fine. With the second twin breech, birthing in the O.R. was standard procedure. It seems like overkill because the birthing wing is so small, and the O.R. is RIGHT THERE, you certainly could be taken there just as quickly as a singleton emergency would. I guess it's the idea that it's known there's an increased risk, because of the breech presentation of the second twin?
I had a breech twin B (who turned after his brother was born and was born vertex) and I did go into the O.R. for the births.
I also got onto the skinny operating table as prompted, when I got there. I was standing on the table for both babies, as upright felt right to me. So crazy!!
I guess they'd have put masks on if there were an emergency requiring surgery? I don't remember any masks.
I was definitely focused inward, though. I specifically recommend HypnoBabies to anyone planning to birth twins in a hospital. We arrived and had to meet the on-call OB (not my regular doctor), who proceeded to try to bully me into an automatic c-section for the breech twin. He didn't think versions (internal or external) were safe or advisable, and he didn't recommend a breech extraction either. In the end, we had agreed on a breech extraction (I really believed the baby would turn, regardless) because I refused the automatic c-section. But basically, I progressed actively that whole time, in spite of the arguing that could have shut me down. I stayed in hypnosis while talking and debating (HypnoBabies allows for that, unlike some other birth hypnosis programs), and I was able to keep the adversarial stuff outside my "bubble."