ɪn ˈɑːɹ. fɹˈæŋk bˈʌsbiz bˈʊk mˈænd səbmˈɜːsᵻbəlz, ɪɾ ɪz stˈeɪɾᵻd ˌɔn pˈeɪdʒ fˈɪfti θɹˈiː ðætðə dˈiːpstɑːɹ fˈoːɹ θˈaʊzənd "kəndˈʌktᵻd sˌʌm fˈaɪvhˈʌndɹɪd dˈaɪvz fɹʌm dʒˈuːn nˈaɪntiːnhˈʌndɹɪd sˈɪksti sˈɪks θɹuː dʒˈuːn nˈaɪntiːnhˈʌndɹɪd sˈɪksti ˈeɪt".
In R. Frank Busby's book Manned Submersibles, it is stated on page 53 that the Deepstar 4000 "conducted some 500 dives from June 1966 through June 1968".