Updated: 10:35 a.m. EST -- Carnival Triumph is being moved to dry dock, where inspections of the ship will begin.

Updated: 8:00 a.m. EST -- A bus carrying passengers from Carnival Triumph to New Orleans broke down during its trip, according to a series of tweets from passenger Clark Jones.

Jones took to Twitter around 3 a.m. EST, to say: "Seriously? This is happening. Our bus is broke down."

Jones then added the hashtags #helpmejesus, #carnivalbusbreakdown and #carnivaltriumph to his next tweet, "2:30 a.m. Bus broken down. Not going anywhere."

According to Jones, the bus was broken down for approximately an hour before passengers and luggage were moved to a replacement bus. He and the other passengers have now reached New Orleans, according to his account.

Updated: 5:30 a.m. EST -- Carnival has officially confirmed that all passengers have been disembarked from Carnival Triumph, according to CNN.

(1:30 a.m. EST) -- Carnival Triumph finally arrived in Mobile after spending four days at sea with little electricity and few toilets.

Tugboats pulled the stricken ship and the more than 4,200 people onboard into port at 9:15 p.m. (8:15 p.m. EST) in a drama that played out on live TV.

Passengers waved towels and flashlights from the railings to show their relief, and chants of "Let me off! Let me off!" could be heard coming from the ship.

Prior to boarding the ship himself, Carnival Cruises Lines' CEO, Gerry Cahill, spoke to the crowd of journalists, passengers' family members and well-wishers.

"First, I'd like to start with saying how very thankful we all are that the ship is alongside and everyone is safe.

"I am so appreciative of the efforts of everyone involved in bringing the Carnival Triumph safely to the Port of Mobile.

"I want to thank the United States Coast Guard, The Port and City of Mobile, Customs and Border Protection, and the countless other parties who have been incredibly helpful throughout.

"I'd also like to thank our shoreside teams for working around the clock to make this happen. And finally, I want to thank our crew for all they have done. We have seen and heard so many reports, online and in the media, from passengers praising the crew's hard work.

"I am now going onboard to talk with our guests and crew, as well as to help with getting our guests off the ship and on their way home. Thank you.”

photos-carnival-triumph-cruise-adrift-engine-fire The company estimated that it would take four to five hours to get all passengers, who had to be cleared by customs officials, off the ship, which had only one working elevator.

Passengers are being taken by bus either to Galveston, Texas, which is about seven hours away, or to New Orleans, two hours away, where Carnival has booked 1,500 hotel rooms.

Triumph crew members also disembarked from the ship in Mobile and will be put up in hotels there. They will then be reassigned to other vessels in the Carnival fleet.

Investigations into the cause of the engine room fire will be undertaken by the Bahamas Maritime Authority, as the ship is flagged in the Bahamas. Earlier this month, Triumph underwent repairs for propulsion problems that stemmed from an electrical issue within one of the ship's alternators.
--by Adam Coulter, U.K. Editor