"If you scan down to the bottom half of page 7 you’ll see that Dyson says that the techniques for carrying out such an attack could be developed and rehearsed using H.E.—high explosive—charges in place of nukes." Simon adjusted his glasses and found the relevant quote: "‘This part of the enterprise would not be expensive and would not require a high level of technological sophistication. Moreover, the installation and testing program could rather easily be camouflaged and kept secret.’"