Remains of northern battery (北部砲台跡)
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Microcache is ruin of northern battery in Okunoshima.
Okunoshima might make you happy currently. However, there were toxic gas plant until the end of WWII.
There is ruin of northern battery. Tiny magnetic container(not nano) was attached a steel object.
Please return the container as you foud to prevent lost.
(No hints available.)