You can legally stream Shutter Island with built-in English subtitles and closed captions on several major platforms:
The missing subtitle appeared for exactly one frame: "You are not Teddy. You are Andrew Laeddis. And these subtitles are your confession."
Once you have downloaded your English .srt file, follow these steps to use them with your movie: [Subtitles] Detailed information for Shutter Island ㅣGOM