To find and use the correct file, you can check these popular repositories that typically host specific Blu-ray rips:
It looks like you are searching for a subtitle file specifically synchronized for the release. subtitle In.the.Heart.of.the.Sea.2015.1080p.Blu...
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: A focused source if you only need the English track. How to use the subtitle file: subtitle In.the.Heart.of.the.Sea.2015.1080p.Blu...