The escape sequence is quite long, and loosely broken up by loading screens.
Part 1 begins immediately after you fling yourself out of the fire pit at the end of Chamber 19.
Guide listing help
Unlike normal walkthroughs, in Nice Game Hints you can select just the puzzle you want hints for. Here are listed the puzzles for "Escape Part 1 (After the Fire Pit)" in Portal. The guide you choose only contains information about that puzzle, reducing possible spoilers for other puzzles.
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