Dutch authorities said Tuesday they found 25 migrants stowed away in a refrigerated container on a United Kingdom-bound ferry.

The ferry -- the Britannia Seaways, which is owned by Danish operator DFDS -- left the Netherlands on Tuesday and quickly turned around to the Dutch port of Vlaardingen after the migrants made a hole in a trailer, the shipping company said in a statement.

"Police officers entered the ship from a police boat that met them as soon as Britannia entered the port," DFDS said.

Twenty-five migrants were found stowed away aboard the Britain-bound Britannia Seaways ferry, authorities said Tuesday. 

Twenty-five migrants were found stowed away aboard the Britain-bound Britannia Seaways ferry, authorities said Tuesday.  (DFDS)

The ship was on its way to Felixstowe in southern England. Two of the migrants were taken to a hospital to be treated for hypothermia. Their conditions were unknown.

The others received medical treatment at the port and were taken to a police location, emergency coordination organization Rijnmond Veilig said in a statement. It was not clear where the migrants were from or how they got aboard the ship.

CLICK HERE TO GET THE FOX NEWS APP

A police dog was used to comb the ship for other migrants but didn't find any, the group said.

The discovery comes weeks after 39 Vietnamese migrants were found dead in a refrigerated truck near London. Two people in Britain and eight in Vietnam have been in their deaths.