The submarine could be armed with either two TIIIc torpedoes with neutral buoyancy (achieved by limiting the number of batteries on board), mines, or a mixture of the two.[5] The torpedoes or mines were accommodated in semi-circular recesses in the side of the hull. These reduced the overall width of the loaded craft, making land transport easier and also reduced drag in the water, but at the cost of weakening the hull.[6]