Titanic tourist sub goes missing sparking search

Can you imagine being so rich that you can drop 250k on a trip? It's a very specialty thing, but holy shit, I don't even want to drop 5k on a trip and then there's people out there casually dropping that kind of cash on an "experience".

Glad to hear they have 4 days of oxygen onboard the sub, so hopefully they can be rescued with no loss of life. Is it weird to anyone else that they don't know when they lost contact? They don't have some kind of communication buoy the sub can use to keep in contact with it's mothership?