Polish Navy Grapples with Unexploded 12,000lb Tallboy Published: October 10th, 2019 Preparatory work to widen and dredge the Piast Canal, ÅwinoujÅcie has unearthed an unexploded Tallboy in northwest Poland. Workers discovered the giant bomb near the ÅwinoujÅcie-Szczecin fairway, 110yds (100m) from the Karsibór ferry crossing, in late September. The Polish Ministry of National Defence confirmed to Britain at War that the device is a Tallboy.