As the British have shown during WWII with the spinning drums bomb designed specifically to breach German dams, concrete arch dams can be very vulnerable to a precisely placed underwater explosion that takes advantage of the surrounding water-pressure to focus the force of the explosion upon a critical spot on the dam. The principle is not to pierce the dam, so the thickness of concrete is not directly material. The principle to to take advantage of the fact that the concrete structure is already heavily loaded by the pressure of water behind it. The explosion focused on the damn imparts a brief but very high force level that overloads the dam and cause it to fail structurally. Modern simulation techniques if anything probably makes intentional dam breaching even easier and more assured.
To replicate this approach the Indians would have to devise a method to drop a depth charge like warhead from a missile, or some kind of torpedo, into the reservoir behind the dam. A conventional airborn missile impact is not likely to work.
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