In or Out? Ferry passengers give their take on Brexit
From Holyhead on Anglesey to Dublin in the Republic of Ireland it is just 60 miles.
But the EU Referendum vote on 23 June could mean there is more than just the Irish Sea separating the UK's second busiest passenger port and the Irish capital.
So what do passengers boarding at Holyhead make of the debate - are they in or out?
BBC Wales' George Herd navigated the choppy waters on a three hour crossing.