Thank you.
I've recently come across an assumption that diesel submarines are noisier than nuclear submarines, and are therefore less capable. In fact, the opposite is true. Diesel submarines are actually very quiet, which means they can operate very covertly; detect a nuclear-powered submarine, for example; track it at close range without being counter-detected; and if necessary, engage.
There is a real value in having diesel-powered submarines with the same weapons capability as nuclear powered submarines. There is also value to having them, when necessary, forward-deployed in those strategic choke points—for example, at the Straits of Gibraltar, and at Suez, Hormuz, Bab-el-Mandeb, and Malacca, and the Panama Canal—where pressure can come to bear on international commerce.