If you've got the money such things can be had, this one goes to 36,000ft https://newatlas.com/triton-submersible-36002/56810/
Also, basically anything in the world can be rented.
https://www.noaa.gov/gc-international-section/rms-titanic-sa...
the things are laying on the ocean floor, and yes it's costly, but ROV tech to go down there and pick things up does exist.
this place apparently has a bunch of pieces of stuff.
https://www.arnabontempsmuseum.com/the-titanic-museum-in-can...
(These are heavy duty unmanned underwater vehicles, tethered to a ship via an umbilical cable. Operator sits topside, sees what is going on via cameras, operating a pair of manipulator arms and assorted tools via fancy joysticks. Think a drone on steroids, Mad Max style.)
And yes, they are expensive, as is the vessel you need to support them.
I was confused by this statement, how is it being consumed by human greed?
I clicked on the link and it brought me to an article titled "Stop plundering of the Titanic, says expert who found wreck" and said "Russians are selling dives"[1]
How can anyone be diving down to the Titanic and stealing from it? It's 12,500 feet below the ocean's surface. The deepest humans can dive with scuba gear is about 350 feet. Sure, maybe they are taking robots down there, but how many such commercial under water robots exist that can go down to that depth? Aren't these very expensive robots? I doubt these are being used for tourist scavenger hunting trips to the Titanic?
[1]https://www.independent.co.uk/life-style/history/stop-plunde...