Imagine if this was you, out on a ship doing oceanographic research for the summer!
That is what student scientist Amalia is doing. Floaters are used to counter the weight of instruments lowered to the ocean floor. In this picture Amalia measures the floaters to determine the buoyancy of different size floaters. My STEM club students at my school will use similar floaters for their ROV.
Here is a picture of the control room for the remotely operated vehicle, called JASON, that will be used to access the instruments already on the ocean floor.