TKRI Nanggala-402, carrying 53, vanished in 2,300ft waters near Bali this week Rescuers found items including grease bottle for periscope and prayer rugs Scan located submarine at around 850m (2,800ft) beneath sea, said military Submarine now declared as officially sunk with no hopes of finding any survivors Officials said oxygen supply on missing KRI Nanggala ran out early on Saturday