A Chinese Navy nuclear-powered attack submarine which docked at the Karachi harbour in May took aboard Pakistani naval officers and sailors to give them a first-hand glimpse of the operations of a nuclear submarine. This was not a simple case of access being given to a close military ally. The Indian Navy is convinced that it is just a matter of time before Islamabad leases a Chinese nuclear submarine. The Pakistan Navy personnel who were on the submarine may be part of their first team to train on Chinese nuclear submarines, it is believed.