from the Tanks." The tanks were Co. B, 711 Tank Battalion. Compared with the DD, the floats were bulky and harder to stow, limiting the number of tanks that could be carried in a landing craft. However, the system was more seaworthy and had the advantage of allowing the Sherman to fire its main gun as it approached the beach. The Sherman's gyroscopic gun stabilization allowed accurate fire even when the tank was being pitched by waves. German equivalent During planning for an invasion of England in 1940 (Operation Sea Lion), the Germans also worked on developing amphibious tanks capable of directly supporting infantry during a beach assault. The Schwimmpanzer II was a modified version of the Panzer II which, at 8.9 tons, was light enough to float with the attachment of long rectangular boxes to either side of the tank's hull. The boxes were made of aluminum and filled with Kapok sacks to preserve buoyancy if water leaked into the pontoons. Motive power came from the tank's own tracks which were connected by rods to a propeller shaft running through each float. The Schwimmpanzer II could make 5.7 km/h in the water. An inflatable rubber hose around the turret ring created a waterproof seal between the hull and turret. The tank's 2 cm gun and coaxial machinegun were kept operational and could be fired while the tank was still churning its way ashore. Schwimmpanzer IIs were deployed from a specially modified landing barge (Type C) and could be launched directly into open water from a hatch cut into the stern. The Germans converted 52 of these tanks to amphibious use prior to Sea Lion's cancelation. Instead of floating, the Tauchpanzer, a modification of the Panzer III and Panzer IV, drove on the sea-bed. A rubber hose supplied the engine and crew with air and gave the waterproofed tank a maximum diving depth of making it an extreme example of a wading tank. The Germans converted 168 Panzer IIIs and 42 Panzer IVs for use in Operation Sea Lion. Surviving DD tanks Valentine A DD Valentine, restored to running condition, is in private ownership in England. The sunken wrecks of eight others, lost during training, are in the Moray Firth in Scotland; two have been located and are regularly visited by recreational divers. Two sunken Valentine DDs rest 3.5 miles out of Swanage Bay, Dorset. These tanks are 100 metres