Deep Ocean Expeditions, the British company offering tours to the Titanic, is also planning a programme of day trips to take people down to the wreck of the Lusitania, off the Irish coast, next year.
Ms Nicola Watts, press officer for the selling agent, Wildwings International, said the first expedition to the 46,326-tonne luxury liner, sunk by a German U-boat in 1915, is "at production stage".
Trips on submersible craft down to the Lusitania should be less expensive than those to the Titanic, she said, as it lies in shallower water and closer to land, just 11 miles off the Old Head of Kinsale, Co Cork.
Meanwhile, Deep Ocean Expeditions's first tourist trip to the Titanic, scheduled for later this month, has been cancelled after RMS Titanic Inc was granted an injunction in a US Federal Court against the expedition.
The travel company has appealed the ruling, although it accepts there will be no tour before the end of the year as the majority of its clients are American and therefore bound by US law. However, it has begun taking bookings from wealthy enthusiasts elsewhere for six planned expeditions next year.
The nine-day voyage costs $35,500 (£25,177), excluding flights to Newfoundland, where trippers will spend one night in St John's before departing on a 36-hour, 368mile trip to the wreck. There, passengers will transfer to a scientific research vessel for a series of lectures by scientists from the PP Shirshov Institute of Oceanology in Moscow.
Dives will take place in two Mir submersibles, each carrying two passengers and a pilot. After a two- to three-hour journey in total darkness to the hulk 12,460 feet underwater they will spend up to three hours exploring the wreckage at a distance of five to 10 metres.
Both the mother ship and submersibles featured in the movie Titanic.
However, Ms Watts said the expedition is not just about reliving the movie. "There is a serious side in that everyone is contributing to the research project on board the ship on plants and marine life. Each trip underwater will be filmed and broadcast back up to the mother ship to help the experts with their research."
