bᵻfˌoːɹ ðɪ ɐtˈæk ˌɔn pˈɜːl hˈɑːɹbɚɹ ʌv dᵻsˈɛmbɚ sˈɛvən, nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi wˈʌn, ænd fɔːɹ sˌʌm tˈaɪm ˈæftɚwɚdz, hˈaɪpoʊ wʌz ɪnðə bˈeɪsmənt ʌvðɪ ˈoʊld ɐdmˌɪnɪstɹˈeɪʃən bˈɪldɪŋ æt pˈɜːl hˈɑːɹbɚ.
Before the attack on Pearl Harbor of December 7, 1941, and for some time afterwards, HYPO was in the basement of the Old Administration Building at Pearl Harbor.