Submersible has 70 to 96 hours of oxygen available, Coast Guard says
David Perry 
The expedition to explore the wreckage of the Titanic costs passengers "from $250,000," according to an archived version of the company's website, accessible via the Internet Archive’s Wayback Machine.
OceanGate Expeditions, the company that operates the tour, advertised the experience as a way "to step outside of everyday life and discover something truly extraordinary.”
“Become one of the few to see the Titanic with your own eyes," it added.
There, up to five people, including a pilot, a “content expert” and three paying passengers, board the submersible named “Titan” and descend to the bottom of the ocean.
“Once the submersible is launched you will begin to see alienlike lifeforms whizz by the viewport as you sink deeper and deeper into the ocean. The descent takes approximately two hours but it feels like the blink of an eye,” the website said.
According to OceanGate, the Titan is a 23,000-pound submersible made of carbon fiber and titanium.
As a safety feature, the sub uses a “proprietary real-time hull health monitoring (RTM) system” that analyzes the pressure on the vessel and the integrity of the structure, the company states. It also has life support for a crew of five for up to 96 hours, the website states.
