Passengers on the Carnival cruise ship stranded in the Gulf of Mexico say conditions are getting worse by the hour-- and there is sewage running down the walls. 

About 4,200 people are stuck on board and say that cabin carpets are soaked in urine, passengers are sleeping in tents on deck and scarce food supplies has reduced them to eating cold onion sandwiches.

The ship has been stranded since Sunday after a fire in the engine room crippled the power system. 

The first tug boat reached the ship on Monday night and it is being towed to Mobile, Alabama at the rate of a few miles per hour. It is expected back on Thursday.

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