Official Estonian subtitles for the Fallout TV series (2024) are not currently available directly within the interface. Prime Video typically offers a wide range of major languages, but smaller markets like Estonia often rely on community-driven or external sources for translated content.
If you find an Estonian .srt file, you can "inject" it into your Prime Video stream using browser extensions. This allows you to watch legally while using your preferred language: The Fallout subtitles Estonian
If no community translation exists, you can generate your own using AI-powered transcription and translation tools. This is a "solid" way to get a rough but functional translation quickly: Official Estonian subtitles for the Fallout TV series