A4 Tunnel Mosl Brunnen Something mysterious on picture

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Mark
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A4 Tunnel Mosl Brunnen Something mysterious on picture

Post by Mark »

I was looking at the pictures of the A4 of autobahnen.ch and is saw this picture:

Image

What is that for 'hole' at the top?
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RMN
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Post by RMN »

Maybee something of the swiss army or a funnel of the tunnel
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