A second view of the kitchen floor prior to demolition - the opening was the original staircase down into the cold cellar
View from the side extension with part of the floor removed. The support beam in the foreground is not attached at either end - it is being supported by the subfloor. The jack in view to the left is supporting the other beam running front to back in the image. The partial beam in the center is completed rotted and has been detached from the floor most likely for several decades.
After removal of some more of the subfloor, the support beams collapsed into the cellar.