Can I Replace Main Bearings Without Removing Crank?

Can I Replace Main Bearings Without Removing Crank? Can I replace main bearings without removing crank? https://www.youtube.com/watch?v=CWrJtUrqDDc How do you remove main bearings from crankshaft? Does the main bearing support the crankshaft? The main bearing is thus designed to tackle various forces along with supporting the crankshaft rotating at high speed. Hence, the material used