Can survive in the vacuum of space indefinitely

High above the Earth's surface, entirely outside its calm blue atmosphere, a lone figure hung motionless against the backdrop of the stars.

Thanks to his inherited Arcosian physiology, Cell didn't need oxygen to stay alive. Like them, he breathed air and was even capable of eating ordinary food, but these things weren't necessary. If he was underwater or in the vacuum of space for extended periods of time, anaerobic respiration kicked in, generating metabolic energy without any breathing at all.

- Bringer of Death Chapter 54