RMS Titanic sank on April 15, 1912 and many commemorations worldwide took place for the 100th anniversary of its sinking. The wreckage is found at N 41° 43.917 W 049° 56.750; I've included it as a child waypoint for your reference and to make the map below look different than what you're used to. Zoom out if you'd like to compare where Omaha is to where the wreckage was. Don't worry, clicking the map choices to the left will take you to the local neighborhood of the physical cache.
The nearest real geocaches to the wreckage appear to be (to the southeast) GCG822, the fabled Rainbow Hydrothermal Vents, and (to the northwest) an Earthcache in Newfoundland and Labrador called Mistaken Point, GC12YV3.
Since I'm not going to be able to get either of those caches any time soon, here's a small commemorative cache for closer to home. I happened to visit the Titanic exhibit a decade ago in Phoenix on the 90th anniversary day, and still have the small hunk of coal I purchased (the only part of the wreckage you can own).
First Class passenger Emil Brandeis embarked at Cherbourg, France and was making his way back to Omaha after visiting his niece in Europe. His father, Jonas, was the founder of the Brandeis Department Store, where Emil was the building director and planner. Emil was not among the survivors. His body was recovered from the icy waters, and he is buried in Omaha's Pleasant Hill Cemetery (the Jewish Temple Israel cemetery on No. 42nd St). Temple Israel's information indicate that Brandeis was cremated in Chicago and that his ashes are buried here.
