ˈækjʊɹət mˈɛʒɚmənts ʌv ɪnsˈɪɾuː sˈaʊnd spˈiːd, tˈɛmpɹɪtʃɚ, seɪlˈɪnᵻɾi, ænd pɹˈɛʃɚ hɐvbɪn ɐtʃˈiːvd dˈʊɹɹɪŋ nˈuːmɚɹəs ɹˈɛplᵻkˌeɪɾɪŋ dˈaɪvz ɐbˈoːɹd dˈiːpstɑːɹ fˈoːɹ θˈaʊzənd tə dˈɛpθs ʌv .
Accurate measurements of in-situ sound speed, temperature, salinity, and pressure have been achieved during numerous replicating dives aboard Deepstar 4000 to depths of .