Arrival of the RRS Ernest Shackleton near Halley Research Station in Antarctica, January, 2013. Original from NASA.… https://www.rawpixel.com/image/440138/rrs-ernest-shackletonFree Image from public domain licenseSir Ernest Shackleton's officers and crew on the deck of the Nimrod: expedition to Antarctica, 1907. Photograph, 1907. https://www.rawpixel.com/image/13959866/photo-image-people-sea-clothingFree Image from public domain license