I did a drop once over the ocean. We put the ashes in a weighted paper bag and I slowed down and out he went.
Had a colleague do a drop of an old guy over the ocean as well. When they returned to the airport sure enough the ashes were all over the side of the helicopter. They took his grieving wife out of the other side and washed off the ashes. I suppose he eventually ended up in the Pacific, but not quite by the intended routing!