Tourists aboard the Titan sub read 'Titanic Remembrance,' a book about the 'unbelievable physical and mental anguish' Titanic victims and survivors went through in the ship's final hours

• Tourists aboard the missing submersible, the Titan, read a book about the Titanic.
• According to OceanGate's Instagram, passengers were given the book "Titanic Remembrance" to read.

Tourists aboard OceanGate's missing Titanic-bound submersible have been reading a book about the final hours of the Titanic's shipwreck.

According to a post from OceanGate's Instagram account, passengers aboard this year's Titanic expedition were given the book "Titanic Remembrance" to read. The book chronicles the lives of the victims and survivors of the Titanic shipwreck and goes into the final hours of many passengers aboard the Titanic.

On Sunday, a submersible vessel carrying five tourists bound for the Titanic shipwreck went missing. The vessel, named Titan and owned by OceanGate Expeditions, was set to show passengers the Titanic shipwreck up close, but communication was lost with the vessel just under two hours into its journey.

In an Instagram post on March 24, OceanGate shared a detail about what the passengers would eventually bring with them in the minuscule vessel.

"We're excited to read Cathy Lamet's new book, "Titanic Remembrance" on expedition this year!" the caption stated. "All the proceeds from the book will be donated to Titanic Societies throughout the world for the upkeep of Titanic graves and memorials."

The book's author, Cathy Lemet, said that the book offers remembrances around the passengers aboard the Titanic.

"For some, their lives would end on that dreadful night," Lemet wrote in the book's bio. "For others, they would survive after a night of unbelievable physical and mental anguish and be forced to carry on for the rest of their lives as best they could."

On Wednesday, rescue officials from Canada and the US said that they intercepted new "banging" sounds underwater, but have yet to locate the vessel.

Tourists paid $250,000 for the trip to venture close to 13,123 feet deep into the ocean.

Passengers on board include the vessel company's founder and pilot, a British Billionaire, one of Pakistan's wealthiest men and his son, and a French Titanic expert known as "Mr. Titanic."