PTI China's Navy Chief Admiral Wu Shengli being received on the deck of INS Shivalik by its Captain Puruvir Das when he visited the ship at Qingdao on Tuesday. Admiral Wu Shengli, China’s Navy Chief, this week caught Indian officials off guard by asking for an impromptu tour of the most sensitive nerve centre of the advanced Indian missile frigate, INS Shivalik, while on a brief courtesy call on the visiting ship. The Shivalik arrived at this eastern port city, which is the base of the PLAN (People’s Liberation Army Navy) North Sea Fleet, on Sunday to take part in exercises on Wednesday to mark the Chinese Navy’s 65th anniversary. Indian officials told Admiral Wu that the ship’s operations room — the Combat Information Centre — was among the Indian Navy’s most advanced and was kept locked when the frigate was docked at harbour. Under standard operating procedures, it cannot be opened without exception. The Admiral’s request surprised Indian officials as navy official