Bari Athènes

With a global Pass the ferry is not free(only with the 6day greek island pass). Costs is arround 30€ (with global interrail pass) and can be booked on www.superfast.com by selecting interrail global pass under discounts.

The ferry can be much more expensive, depending on the season. During the high season, global pass holders effectively only get a small discount.

You should also compare with regular ferry tickets, especially if you're under 26 or over 60, since the age discount can turn out to be more beneficial than the pass discount, depending on the exact date.