Getting visas to attend programs like YC

Hi all, A group of us were interested to apply for the YC program in the summer but were detered because of visa issues.

All three members in the group currently have full-time jobs and two of us are on H1-B visas. The third member of the team is a U.S. citizen. Quitting our jobs to attend YC fulltime is therefore difficult as two of us will lose our H1-B status and will not be able to stay in the country.

I read on the YC website that people from other countries have been able to participate in YC before. I was wondering if anyone knows anything about this? What visa status were they on? Is there a temporary business visa available for this sort of situation?

Also, if you are facing similar problems, feel free to comment.

Thanks