In SR and GR, length or distances are obtained by what I call a "procedure" using light and clocks. This definition or procedure deviates from the more familiar ruler distance but it is the most practical solution to obtain distances between two objects in relative motion. Consider now an observer outside of the Schwarschild radius of a black hole and another "observer" inside the Schwarzschild radius. How will the outside observer measure the distance between him and the inside observer (as no light signal can be sent back from the inside observer) ? The procedure to measure distance seems no longer to work. So for the outside observer, even the whole concept of geometry seems to have lost its meaning for the region inside the Schwarschild radius. Probably, I'm making some mistake here. Can someone help me out ?