> One asset that India can threaten is Diego Garcia.

Case in point. I wouldn't expect a submarine to occupy the littorals of San Francisco, but an attack on Florida, Hawaii, or a distant base would be difficult to defend against.

Of course, such an attack is basically suicide, but still a possibility. Defensive systems like AEGIS are stretched too thin to deter a coastal attack.

You think so ? That is interesting. I am no expert though.

I expect Indian subs to be kept good track of. Threatening Florida seems a stretch. Assets in around Indian Ocean are a distinct possibility. In fact India does not need subs for that.