Submarine Player is a Mac application that automatically generates subtitles in English for any video, regardless of the original language, and displays them instantly during playback. Operating fully offline, it supports 19 languages and multiple video formats like MP4, MKV, and AVI. Users can select between fast or highly accurate transcription models, display dual subtitles for language learning, or opt for original-only captions. Subtitles can be exported in formats such as SRT, VTT, and CSV. The app also includes transcription-only mode, making it ideal for both native viewing and multilingual accessibility without requiring an internet connection.