They deployed the EASEP, which included a passive seismic experiment package used to measure moonquakes and a retroreflector array used for the lunar laser ranging experiment.
ðeɪ dᵻplˈɔɪd ðɪ ˈiːzɛp, wˌɪtʃ ɪŋklˈuːdᵻd ɐ pˈæsɪv sˈaɪzmɪk ɛkspˈɛɹɪmənt pˈækɪdʒ jˈuːzd tə mˈɛʒɚ mˈuːŋkweɪks ænd ɐ ɹˌɛtɹoʊɹᵻflˈɛktɚɹ ɚɹˈeɪ jˈuːzd fɚðə lˈuːnɚ lˈeɪzɚ ɹˈeɪndʒɪŋ ɛkspˈɛɹɪmənt.