It's connected to the one of the larger asteroids on the planets inner ring. 
We're inserting directly in at area-14 in the left corner. The dropship / Corvette is fitted with gear to quietly insert teams into facilities through an otherwise solid hull. 

[img=http://i1298.photobucket.com/albums/ag58/Silux45/ce5f742f-f989-481e-b40b-1d533ca64347_zps1231ebe1.png]