Rocks dug up during construction were saved and incorporated into the poured-concrete floors and walls. Hydronic heating coils in the floor are augmented by a wood stove during the damp winters.  Search “잠실오피【uudat7】닷【COM】❊잠실오피✡잠실건마≠잠실스파✉잠실출장∃잠실휴게텔㏇잠실안마” from Diamond in the Rough (and Ready)

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Rocks dug up during construction were saved and incorporated into the poured-concrete floors and walls. Hydronic heating coils in the floor are augmented by a wood stove during the damp winters.