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This is when we started
to dig in to defend
against attack. [narrator] Back then,
British defenders needed the tunnels to survive
Spanish assault during the great siege
of Gibraltar. during the great siege
of Gibraltar
to dig in to defend
against attack. [narrator] Back then,
British defenders needed the tunnels to survive
Spanish assault during the great siege
of Gibraltar. during the great siege
of Gibraltar
Full Transcript
00:00:01.000 --> 00:00:04.601
This is when we started
to dig in to defend
against attack.
00:00:07.201 --> 00:00:09.401
[narrator] Back then,
British defenders
00:00:09.401 --> 00:00:12.501
needed the tunnels to survive
Spanish assault
00:00:12.501 --> 00:00:12.834
during the great siege
of Gibraltar.
00:00:12.834 --> 00:00:13.834
during the great siege
of Gibraltar.
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Movie Summary
The world's most incredible engineering projects are revisited to uncover why places full of mysteries and untold secrets are now abandoned ruins.