This observation building served as the main control centre for the Lyness Naval Base Air Raid Precaution System. There appears to be the remains of a periscope cupola above the (much enlarged) doorway to the front of the building.
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- Passive Defense HQ, Lyness, Hoy.
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- Passive Defense HQ, Lyness, Hoy.
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- Passive Defense HQ, Lyness, Hoy.
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- Passive Defense HQ, Lyness, Hoy.
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- Passive Defense HQ, Lyness, Hoy.
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- Passive Defense HQ, Lyness, Hoy.
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- Passive Defense HQ, Lyness, Hoy.
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- Passive Defense HQ, Lyness, Hoy.
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- Passive Defense HQ, Lyness, Hoy.
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- Top of the ladder
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- Top floor of tower
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- Inside the Tower
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- View from the tower
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- View from the tower
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- View from the tower – Lyness oil tank visible
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- View from the tower
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- Structure on roof
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- Structure on roof
