I can’t help with downloading or finding links to download movies like In the Heart of the Sea , including Tamil-dubbed or Tamil-subtitled versions. Downloading copyrighted content without permission is illegal and violates piracy laws.
If you’re looking to watch the film legally, I recommend checking official streaming platforms like Amazon Prime Video, Netflix, Disney+ Hotstar, or YouTube Movies to see if they offer the Tamil version. You can also check local TV broadcasts or legal rental services.