Earlier today (December 30), Eurostar announced that it would be cancelling all of its services for the day after flooding occurred in tunnels.

Now though, it has been confirmed that the Eurostar will run as usual on Sunday after the flooding under the River Thames was brought under control.

The train operator added that speed restrictions may cause delays on Sunday.

The flooding meant that tens of thousands of travellers had their New Year's Eve celebrations affected after Eurostar cancelled all trains to and from London amid tunnel flooding chaos.

Eurostar said it was “extremely sorry” after the disruption left thousands of people stranded at St Pancras International station not knowing what to do next.

In a statement, Eurostar said: “Flooding in the Thames tunnels has been brought under control by Network Rail High Speed meaning at least one tunnel can now be used and a full service can operate.

“There will be some speed restrictions in place in the morning which may lead to delays and stations are expected to be very busy.

“Unfortunately, this unprecedented event has caused major disruption to customers today.

“Customers are encouraged to visit the Eurostar website for more information on their journey and compensation entitlement.”

What caused the flooding that affected Eurostar services?

It's believed that the flooding was caused by a burst pipe feeding the tunnel’s fire safety system, a water company said.

Footage shot in the tunnel showed water gushing from a pipe.

London St Pancras saw emotional travellers sitting on suitcases on Saturday morning as people could be heard frantically trying to find alternative routes to their destinations.

@uktoday_ I got the Eurostar to Brussels to see the Christmas markets🎄 #brussels #christmasmarket #belgium #bruges #eurostar #travel ♬ Night Themes - Emerson Augustine

One disgruntled traveller said she “freaked out” when cancellations were announced and has “nowhere to stay” while she waits for trains to restart.

A man, presumed to be a taxi driver, was also seen wandering around the station clutching an iPad which said “taxi to Paris”.

The problem also meant that Brits have been left “stranded” in mainland Europe.

Water company Thames Water said it believed the flood was caused by a “fire control system and not a Thames Water pipe”.

Some railway tunnels, including the Channel Tunnel, have water systems installed as a fire safety measure.

How many passengers were affected?

When a Eurostar train is full, it will hold “nearly 900 passengers” according to the firm’s website, meaning as many as 36,000 people could be affected after all 41 services were cancelled.

Engineers working on the tunnel said water levels were reducing but warned the volume of water in the tunnel is “unprecedented”.

Images captured from the Ebbsfleet entrance to the tunnel show water tankers working at the site.

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Earlier today, a Eurostar spokesperson said: “Flooding in the tunnels between St Pancras international and Ebbsfleet has not improved and train services are unable to operate.

“Eurostar has therefore had to take the unfortunate decision to cancel all services for the rest of the day. This is a total of 41 trains.

“Eurostar is extremely sorry for the unforeseen issues affecting customers today but safety remains our number one priority.

“We understand this is a vital time to get home at the end of the festive season and ahead of New Year and we are supporting customers in stations.”