A fortified sentry post constructed inside the hollowed-out head of a fallen coastal…

• antenna
• armor
• body
• body of water
• body part
• building feature
• cliff
• coastline
• device
• electronic device
• figure
• fissure
• gear
• head
• headwear
• helmet
• iron
• light
• metal
• ocean
• outpost
• sentry
• water
• window

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