Researchers quickly determined that a leaking hydrogen fuel line ruptured when exposed to vacuum, causing a loss of fuel pressure in engine two.
ɹᵻsˈɜːtʃɚz kwˈɪkli dɪtˈɜːmɪnd ðˌæɾə lˈiːkɪŋ hˈaɪdɹədʒən fjˈuːəl lˈaɪn ɹˈʌptʃɚd wɛn ɛkspˈoʊzd tə vˈækjuːm, kˈɔːzɪŋ ɐ lˈɔs ʌv fjˈuːəl pɹˈɛʃɚɹ ɪn ˈɛndʒɪn tˈuː.