Vladimir Sharun, sound designer on Stalker, is convinced that they were all poisoned by the chemical plant where they were shooting the film.
vlˈædɪmˌɪɹ ʃˈɑːɹɹʌn, sˈaʊnd dɪzˈaɪnɚɹ ˌɔn stˈɔːkɚ, ɪz kənvˈɪnst ðæt ðeɪ wɜːɹ ˈɔːl pˈɔɪzənd baɪ ðə kˈɛmɪkəl plˈænt wˌɛɹ ðeɪ wɜː ʃˈuːɾɪŋ ðə fˈɪlm.