Is all "dark tourism" immoral? A submersible that promised five wealthy tourists a tour of the Titanic has gone missing in the deep, with little hope of return. Some say it encapsulates the ills of our obsession with tragedy.
Race against time to rescue lost Titanic sub
Deadly depths: Contact with the sub was lost just one hour and 45 minutes into its descent to the wreck site. Glossary
Titanic - The RMS Titanic was the largest ship afloat at the time and it is the deadliest cruise ship disaster in history.
Macabre - Gruesome or ghastly.
Exploitative - Using someone or something in an unfair or morally wrong way — but in a way that benefits you.
Catacombs - An underground cemetery, with passages and rooms where bodies were buried in the past.
Pompeii - A Roman town in Italy. It was buried under ash after a nearby volcano erupted. The ash preserved the town so well that today people can walk through the streets and into some buildings.