Half-Life Sounds - The Cutting Room Floor [library of unused sounds from Half Life 1]
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Half-Life (Windows)/Sounds - The Cutting Room Floor
https://tcrf.net/Half-Life_(Windows)/Sounds
Half-Life contains a multitude of unused sounds, character voice lines and vocabulary words used for "speaking" entities such as the HEV suit and announcement system.
The file "sound/sentences.txt" contains a list of sentences allowing the game to easily call a sound, or string of sounds, for these purposes. This page includes both unused sentences and unused sound files without an associated sentence.