A Biber attack on Antwerp's locks

A viewer contributes a late-war Kriegsmarine midget-submarine episode. In the account read aloud, a Biber operated by a senior midshipman identified as Langsdorff fired two torpedoes into Antwerp's locks and put them out of operation for twenty days. The operator did not return. The episode is not verified or analysed in this exchange; it is left as a possible subject for further investigation. Its operational details therefore remain the viewer's claim, but the passage offers a lead into the risks and possible effects of midget-submarine attacks.