Can't say I've heard the expression before, but interesting story. "For three years Marie Jalowicz Simon lived a life of isolation and fear in the dark heart of Nazism. She was what the Gestapo called a U-Boat, one of the scores of Jews who managed to survive out of sight beneath the surface of society. Marie remained hidden for three years in Berlin and her battle to avoid capture and stay alive is told in a powerful new book, Submerged. She died 15 years ago but the book, just published in Germany, is based on tape recordings she made about her time in hiding. ‘She became a submarine and she stayed submerged and she lived,’ said her son Hermann. From 80 cassette tapes, Hermann and author Irene Stratenwerth have produced what has been described as a masterpiece. The book says that by 1941 both Marie’s parents were dead. She was 25 and working as a slave labourer at an arms factory in the capital. By this time the Nazis’ plans for Jews had moved from deportation to slavery and eventual extermination. As time dragged on and workmates disappeared, she realised that she could be next. So she failed to turn up for work one day and then went to the forced labour office pretending to be a neighbour who said Marie Simon has been deported. Despite her ruse, the Gestapo came looking for her and she had to go on the run. She said: ‘I did not want to belong to the community of death. I wanted to live.’" http://www.dailymail.co.uk/news/article-2577527/I-lived-Nazis-years-U-boat-Jew-Amazing-testimony-woman-survived-Holocaust-revealed-15-years-death.html#ixzz2vc4PvsDw
Fascinting story Gordon. I've heard of people hiding in caves to avoid capture, but this is a first for me.