A new PLOS One article documents the carcasses of a whale shark and three rays found at a depths over 1,200 meter, providing a rare opportunity to learn about deep water taphonomic processes and the biotic communities that live off of these food falls.
No collections or measurements could be made, but they have photos and videos.
Higgs ND, Gates AR, Jones DOB (2014) Fish Food in the Deep Sea: Revisiting the Role of Large Food-Falls. PLoS ONE 9(5): e96016. doi:10.1371/journal.pone.0096016
See a summary of the article at Live Science.