While Shadow Divers is a "good read" the reality is that it is a dramatized account "based" on a true story - not an unbiased documentary like the author and Chatterton and Kohler would have you believe. While the idea that a "circle-run" torpedo sunk the U-869 is possible, the physical evidence does not support that conclusion. Before anyone cites Shadow Divers and these articles as "fact" you should read Gary Gentile's book, Shadow Divers Exposed. While Gentile's book is not as well written or polished, and he could be viewed as having his own axe to grind, the points he make cast considerable doubt on the conclusions in the WDM article and Shadow Divers itself. Don't take my word for it, read both books and judge for yourself. The most likely cause for the sinking is two direct depth charge hits - one near the conning tower and one above the rear torpedo room. In fact, the illustration by Dan Crowell at the beginning of Shadow Divers shows just such damage and the existence of the giant "blast hole" at the rear of the U-869 is almost totally ignored in Shadow Divers.