Cant re enter the motherless board

Ive made it to the Motherless board,left and now my way is blocked and cant find any way back in. Help!!! Lol

unfortunatly you either have to load a 2nd player (presuming its console) and go to concordia then load yourself in BUT if you do that you get locked out of the motherless board unless you use said save that hasnt started the quest to go in and take you to that location

Well thats stupid.