Tunnel flooding under the River Thames strands hundreds of travelers in Paris and London

Eurostar services to and from London were canceled Saturday after a tunnel under the River Thames became flooded, disrupting festive travel plans.

Hundreds of travelers trying to get across the English Channel were stranded at London's St. Pancras International station and the Gare du Nord station in Paris. Eurostar, which runs services from London to Paris, Brussels and Amsterdam, said it canceled at least 29 trains Saturday and is not expected to run any services for the rest of the day because of the flooding.

Engineers working on the tunnel said water levels were reducing. The volume of water in the tunnel was "unprecedented," they said.