On 15 August, a recording of the Emperor's surrender speech (""Gyokuon-hōsō"", literally ""Jewel Voice Broadcast"") was broadcast over the radio (the first time the Emperor was heard on the radio by the Japanese people) announcing Japan's acceptance of the Potsdam Declaration. During the historic broadcast the Emperor stated: "Moreover, the enemy has begun to employ a new and most cruel bomb, the power of which to do damage is, indeed, incalculable, taking the toll of many innocent lives. Should we continue to fight, not only would it result in an ultimate collapse and obliteration of the Japanese nation, but also it would lead to the total extinction of human civilization." The speech also noted that "the war situation has developed not necessarily to Japan's advantage" and ordered the Japanese to "endure the unendurable." The speech, using formal, archaic Japanese, was not readily understood by many commoners. According to historian Richard Storry in "A History of Modern Japan", the Emperor typically used "a form of language familiar only to the well-educated" and to the more traditional samurai families.