The origin project LIFEGATE introduced the prospect of multimode fibre based holographic endoscope as a unique tool for highresolution in-vivo imaging of structures residing deep inside the brain of animal models. It harnesses the power of controlled light transport through hair-thin MMFs to image and measure brain functions at single cell and sub-cellular level in virtually any brain structure, at unlimited depth and in uniquely atraumatic manner, thereby unlocking a variety of opportunities when answering urgent bio-medical questions.