The author's tone is that he wants to "dive deep" into ocean exploration because the ocean is a mysterious underwater world that holds secrets that may help humanity. According to the text also feels very excited and amazed towards the ocean. " Our next big leap into the unknown can be every bit as exciting and bold as our pioneering work in space. It possesses the same “wow” factor: alien worlds, dazzling technological feats and the mystery of the unknown." This quote proves just how much passion Cousteau has for the beautiful big blue.
*PLEASE quote or give credit in someway or form. Thanks!*