John shares insight & observation from Ernest Shackleton's INCREDIBLE Trans-Antarctic expedition to cross the Antarctic continent in 1914 as told in the book "Endurance - Shackleton's Incredible Voyage" by Alfred Lansing (link below).
https://www.amazon.com/dp/0465062881?linkCode=ssc&tag=onamzwarri0e-20&creativeASIN=0465062881&asc_item-id=amzn1.ideas.2EVTKX9M93LJN&ref_=aip_sf_list_spv_ofs_d_asin