Were they pieces of the submersible in question? I don't remember hearing about this... unless someone went down in secret... oops
The Titanic movie film crew hired a Russian crew to take them to the site to get footage for the movie. Apparently they were trying to get places no one else had ever been, for more dramatic footage, when an accident occurred that damaged both the submarine AND the Titanic. There are a lot of people apparently trying to keep this hush-hush. When the R.M.S. Titanic Salvage crew arrived on scene (this was in 1996 and they had to wait for the film crew to leave even though they own the salvage rights), they found many submarine parts lying on the Titanic and were easily able to put two and two together. There are A LOT of people extrememly upset over this and the carelessness of the movie crew.