Two men wearing space suits are shrunk down and walking inside the human body, cells, cell, blood cells, organelles, delicate and dynamic filaments, cytokines, nucleus, protein molecules, cell membrane, neurons and synapses, extracellular matrix, intricate network of endoplasmic reticulum, extremely detailed 8K, smooth, high resolution, ultra quality, highly detailed, true light, glare, cinematic lighting, Iridescent, Global illumination, real light, real shadow, hd, 2k, 4k, 8k, 16k