brother i agree although this arihant class submarine is not quite as close to U-571 in terms of performance in shallow waters but still the stealth features that it incorporates is better than Arjun and other MBT's in the same league but the main point that makes it unique is that it can almost hit mach-1 in a dive and the sonic boom created is merged into its engine thereby reducing its heat signals......the anti aircraft gun made by ISRO that is installed on its deck can fire surface to air missiles too....lets hope the production goes smoothly and without any funds shortage