Woolworth Building, swimming tank.

Woolworth Building. Swimming tank.

Woolworth Building, swimming tank from S.E. corner.

Woolworth Building, sub-basement swimming pool from S.W. corner.

Woolworth Building, basement large room, S.W. corner view from east end.

Woolworth Building, sub-basement central section, boiler room.

Woolworth Building. Hall from entrance.

Woolworth Building, sub-basement engine room from S.E. looking N.W.

Woolworth Building, sub-basement from N.E. corner room from S.W. corner.

Woolworth Building, sub-basement center south.

Woolworth Building, sub-basement engine room from S.W. corner looking N.E.

Woolworth Building, basement from N.E. corner looking west.

Woolworth Building, sub-basement, coal bunkers from east end.

Woolworth Building, [sub-basement from] center [loo]king N.W.

Woolworth Building, sub-basement midway between boiler and engine room looking east.

Woolworth Building, basement from S.W. corner, vaults looking N.E.

Woolworth Building, boiler room.

Woolworth Building, engine room.

Woolworth Building. Pump room.

Woolworth Building. Boiler room.