Arihant is just one of the launch platforms. There are dozens of Agnis spread all over. The talk of Chinese might and superiority is nothing but puffed up bulls***. None of Chinese nuclear submarines has ever made a deterrent patrol till now. Sure they are powerful, but India is not a weakling. All you see is Chinese doing fancy stuff, "successfully testing" exotic weapons while you see nothing even remotely positive about us. Do you really beleive all that what's shown to you in media ? If Chinese had the capability of doing what you think, they'd have bullied us in a long time ago. We had two serious conflicts with them in middle of 1980s and they couldn't do anything except blowing a great deal of hot gas. We do it quietly and steadily while they like to show off. Actually I had a pretty good discussion with some folks this afternoon on this issue.