Gibraltar is not part of the Brexit agreement.
Therefore there is just 72 hours to reach a deal between Spain and the UK.
If there is no deal then there will be a hard border.
The only exception will be the 15,000 existing registered cross border workers.
A hard Brexit for Gibraltar will affect access to air space, custom checks and tight regulations regarding cross border movement for people living in that part of Spain who shop in Gibraltar and register their cars there.