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501/621, Z 6

501/621, Z 6

The only part that is visible on the outside.

501/621, Z 6

Long stairs leads to this interesting bunker which is a 501 attached to the back of a 621.

501/621, Z 6

The 501 is connected to the tunnel.

501/621, Z 6

In the back corner is a passage to the 621.