ðə hˈiːliəm ɪnðə bɹˈiːðɪŋ ɡˈæs tɹˈaɪmɪks, wˌɪtʃ ɪz jˈuːzd tʊ ɐvˈɔɪd nˈaɪtɹədʒən nɑːɹkˈoʊsɪs ˌɔn dˈiːp dˈaɪvz, ɡˈɪvz ðə ɡˈæs ɐ hˈaɪ θˈɜːməl kɑːndəktˈɪvᵻɾi kəmpˈɛɹd wɪð ˈɛɹ, mˌeɪkɪŋ ɪɾ ˌɪnɐpɹˈoʊpɹiət fɔːɹ dɹˈaɪsuːt ɪnflˈeɪʃən.
The helium in the breathing gas trimix, which is used to avoid nitrogen narcosis on deep dives, gives the gas a high thermal conductivity compared with air, making it inappropriate for drysuit inflation.