Cobol. Being a bit pedantic here, but Capt. Thain didn't make a mistake. It was a lack of knowledge by all concerned about how slush degrades acceleration. He was eventually absolved of all mistakes, if I remember correctly.
By pure coincidence, I met him at his home a few years before he died, when my farmer friend collected some equipment from another farm. I didn't know who he was until my friend was making out his cheque. Another coincidence, I dated Capt Rayment's niece for six months . He lost his life in that accident.