You may think of single-celled organisms as being microscopically small, but these ocean dwellers are a little heftier than that.

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Sources:
https://www.researchgate.net/profile/Andrew_Gooday2
Tendal and Lewis, NZ Journal of Marine and Freshwater Research (1978), 12: 197-203
Swinbanks and Shirayama, Nature (1986), 320: 354-358
Hopwood et al, Journal of the Marine Biological Association of the UK (1997), 77: 969-987
Rothe et al, Deep Sea Research I (2011), 58: 1189-1195
Gooday et al, Biological Conservation (2017), 207: 106-116
http://oceanexplorer.noaa.gov/explorations/03windows/background/education/media/03win_giants.pdf
http://news.nationalgeographic.com/news/2011/10/111026-deepest-mariana-trench-giant-amoebas-science-oceans/
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Images:
https://www.flickr.com/photos/51647007@N08/5277250609/
http://www.photolib.noaa.gov/htmls/expl6258.htm
https://www.flickr.com/photos/51647007@N08/5277251291/