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21 days underwater: Why did engineers stay trapped for weeks?
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--- FOOTAGE CREDITS (Educational Fair Use) ---
• Footage courtesy: Mega Salvage (@MegaSalvage) — https://www.youtube.com/watch?v=THtTX6oglFI
• Footage courtesy: Hydraulic Press Channel (@HydraulicPressChannel) — https://www.youtube.com/watch?v=8tW4zfTeJqM
• Footage courtesy: British Pathé (@britishpathe) — https://www.youtube.com/watch?v=moitnNxAfuA
• Footage courtesy: Sunflyer54 — https://www.youtube.com/watch?v=6Efvl6AwILo
• Footage courtesy: Mega Build World (@MegaBuildWorldTV) — https://www.youtube.com/watch?v=WeRC_2W0Vx0

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Learning
Transcript
00:0021 days underwater? Why did engineers stay trapped for weeks?
00:04They weren't just deep. Water pressure could crush a submarine like a can.
00:09Here's the secret. Workers built a dry bubble inside the TBM.
00:13The surrounding tunnel was still flooded.
00:16This hyperbaric chamber needed weeks of slow depressurizing.
00:19They couldn't just leave. This incredible feat saved the tunnel.
00:23More deep-sea secrets? Check the link in bio.
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