Nerds on Vacation

Sarah and her friends are on vacation from their college in the U.S. They have visited the old city of Prague. Sarah wants to see the historic sights while the others are there to party and drink. When another group joins them for a local tourist challenge into the tunnels deep under the city. Sarah and a new friend are weary, but the others see it as a challenge at a chance to get free beer. What awaits them under the old city?