high fence with barbed wire wound on an endless barbed prickly spiral. the high-speed train track is a protected depot for undergr

area barb barbed barbwire barrier blue border boundary camp clouds criminals danger dangerous defense depot enclosure endless fence forbidden frame freedom guard high highspeed iron isolated isolation jail menacing metal military old prevent prickly prison prisoner private property protect protected protection punishment safety secure security sharp sky speed spiral steel tra track train undergr underground war wire wound zone