Similarly, the iconic line: "It's not 3.6 roentgen... it's 15,000." Vietsub artists added a silent pause in the subtitle timing, letting the number hang in the air for a full two seconds before displaying "15,000" in bright red text. That is not translation; that is cinematic subbing.
Many scam sites offer "Chernobyl Vietsub.exe" files. Always look for .mkv or .mp4 containers with embedded .ass (Advanced SubStation Alpha) subtitles, not executable files. Chernobyl Vietsub