hidden tunnel
definitions
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A physical passage or underground corridor that is concealed, secret, or not easily visible to others.en: A physical passage or underground corridor that is concealed, secret, or not easily visible to others.
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A metaphorical secret method, route, or way to bypass obstacles or achieve a goal undetected.en: A metaphorical secret method, route, or way to bypass obstacles or achieve a goal undetected.
examples
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Under cover of darkness, they infiltrated the pass through a hidden tunnel.
Under cover of darkness, they infiltrated the pass through a hidden tunnel.
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The hacker found a hidden tunnel in the security system to access the data.
The hacker found a hidden tunnel in the security system to access the data.