george bassadone employs 70 spanish workers converting suv's into ambulances used by the united nations and aid organizations all over the world. >> the work that we do is very specialized, involving a lot of electronics, mechanical work. so, we tend to find that expertise in spain. >> reporter: his business is dependent on one of the cornerstones of the european union, free movement of people and goods across open borders. gibraltar imports almost everything from its food to timber over its one mile land border with spain. bassadone was among the 96% of gibraltar residents who voted to remain in the e.u. in last year's referendum, when the overall majority of voters in the united kingdom voted to leave. >> the biggest fear we have is a potential closure of the border. we would have to reevaluate our spanish workforce and look at possibly getting rid of the majority of our spanish workers and trying to train up locals, which would be very disruptive and take up a huge amount of time to do. >> reporter: are there locals who want to do these jobs? >> that would be one of the big challenge