 But even this was subject to more delays as the detailed specifications had to be approved and this didn't occur until 31 August 1948, likely delayed by the Tito–Stalin split and the start of the Berlin Blockade, both in June.With the approval of the specifications, TsKB-17, the heavy-ship design bureau, began work on the sketch design to be submitted for approval to the Council of Ministers before the start of the technical design could begin.By March 1949, four alternatives had been completed, differing mainly in the arrangement of the 130 mm guns and the boiler layout.