The salvage firm that has plucked silverware, china and gold coins from the wreckage of the Titanic now wants to recover the Marconi wireless telegraph machine that transmitted the doomed ship's increasingly frantic distress calls.

Lawyers for the company, RMS Titanic Inc, called witnesses before a federal judge on Thursday to explain why the company should be allowed to possibly cut into the rapidly deteriorating ship to recover the device before it's irretrievable.

“It's one of those iconic artifacts, like the signal flares (that the sinking ship launched),” testified David Gallo, an oceanographer who retired from Woods Hole Oceanographic Institution and is now a paid consultant for the firm.

Dr Gallo, who testified in federal court in Norfolk, Virginia, said that salvaging the device would not be “grave robbery” but a way to connect people to the ship's legacy and honor its passengers.

US district judge Rebecca Beach Smith, the maritime jurist who presides over Titanic salvage matters, said it was too early for her to make any decisions on the proposal. She said she needed more details and proposed scheduling another hearing sometime in the future.

Titanic survivor's granddaughter 'reveals truth' Show all 10 1 /10 Titanic survivor's granddaughter 'reveals truth' Titanic survivor's granddaughter 'reveals truth' Artist impression showing the 14 April 1912 shipwreck of the British luxury passenger liner Titanic GETTY IMAGES Titanic survivor's granddaughter 'reveals truth' The SS 'Titanic', leaving Belfast to start her trials, pulled by tugs, shortly before her disastrous maiden voyage of April 1912 GETTY IMAGES Titanic survivor's granddaughter 'reveals truth' Callers at the offices of the White Star shipping line, making enquiries about the welfare of friends or relatives after the sinking of the Titanic, April 1912. GETTY IMAGES Titanic survivor's granddaughter 'reveals truth' April 1912: Lowering the lifeboats on the SS Titanic after the liner collided with an iceberg. Original Publication: From a page of The Graphic, 1912 GETTY IMAGES Titanic survivor's granddaughter 'reveals truth' 4th April 1912: Latitude 41' 46N and longitude 50' 14W, the place where the 'Titanic' sank GETTY IMAGES Titanic survivor's granddaughter 'reveals truth' Survivors of the Titanic disaster boarding a tug from the liner which rescued them GETTY IMAGES Titanic survivor's granddaughter 'reveals truth' Survivors of the 'Titanic' disaster in a crowded lifeboat GETTY IMAGES Titanic survivor's granddaughter 'reveals truth' 29th April 1912: Relatives waiting for survivors of the 'Titanic' disaster at Southampton GETTY IMAGES Titanic survivor's granddaughter 'reveals truth' May 1912: The crew of the 'Titanic' waiting near one of the lions at Portsmouth Town Hall for the court to open. GETTY IMAGES Titanic survivor's granddaughter 'reveals truth' 11th May 1912: A group of survivors from the Titanic arrive in Liverpool kitted out in suits and bowler hats and with suitcases. GETTY IMAGES

The Titanic was traveling from England to New York when it struck an iceberg at 11.40 pm on 14 April, 1912. The large and luxurious ocean liner sent out distress signals using the relatively new Marconi wireless radio system.

The messages in Morse code were picked up by other ships and onshore receiving stations. They included: “We require immediate assistance” ... “Have struck iceberg and sinking” ... “We are putting women off in boats.”

The ship sank in less than three hours, with the loss of all but 700 of the 2,208 passengers and crew.

An international team led by oceanographer Robert Ballard located the wreckage in 1985 on the North Atlantic seabed, about 400 miles off Newfoundland, Canada.

RMS Titanic Inc oversees a collection of thousands of items recovered from the site over the years as the court-recognised salvor, or steward of the artifacts.

The company has argued that time is running out to retrieve the telegraph machine. It has been referred to as “the voice” of the Titanic, which also delivered the ship's last words.

The device is located in a room on the ship's deck. A gymnasium on the other side of the grand staircase has already collapsed. The roof above the telegraph machine has begun to perforate.

"I'm not sure if we go in 2020 that the roof won't be collapsed on everything,” testified Paul Henry Nargeolet, director of the company's underwater research program.

The company is already facing resistance from the National Oceanic and Atmospheric Administration (NOAA) , which represents the public's interest in the wreck site.

The US attorney's office in Virginia represents the NOAA. Its attorneys argued in court documents that the proposed retrieval runs contrary to prior court orders that prohibit the firm from cutting holes or taking items from the wreck.

The items that the firm has salvaged came from a debris field outside the ship.

“It seems clear that this is not simply a 'one-off' proposal for the Marconi wireless telegraph, but a placeholder for future requests to take similar actions in order to recover other artifacts from inside the wreck,” federal attorney Kent P Porter wrote.

Mr Porter also wrote that the court must consider international agreements involving the wreck as well as archaeological standards to determine whether the retrieval is justified. He cited the United Kingdom-based Joint Nautical Archaeology Policy Committee, which said the company has failed to adequately justify its proposal.

Karen Kamuda, president of the Massachusetts-based Titanic Historical Society Inc, told the Associated Press in an email that the society “has been against disturbing the wreck since 1985 because it is a gravesite”.