ɪt wʌzɐ nˈaɪnhˈʌndɹɪd sˈɪkstitˈʌn ˈaɪɚn tɹˈækɪŋ kˌæloːɹˈɪmᵻɾɚ hˌuːz pɹˈaɪmɚɹi pˈɜːpəs wʌz tə sˈɜːtʃ fɔːɹ pɹˈoʊtɑːn dᵻkˈeɪ, ɔːlðˈoʊ ɪts dˈeɪɾə wʌz ˈɔːlsoʊ jˈuːzd tʊ ɪnvˈɛstᵻɡˌeɪt ðə pɹˈɑːpɚɾiz ʌv nuːtɹˈiːnoʊz.
It was a 960-ton iron tracking calorimeter whose primary purpose was to search for proton decay, although its data was also used to investigate the properties of neutrinos.