This protogen's got just about everything a freediver could ask for: Webbed hands and feet, fins on his tail, an internal air tank giving him a few extra breaths, and an automatic mapping system in his head. He works in charting out underwater places, and is quite good at it thanks to all his aquatic parts helping him out! Today he's exploring a pretty interesting one, with small openings in its ceiling that are letting sunlight in to a reef. Pausing for a moment to watch some little fish, his lungs refill with a new breath from his tank, a reminder popping up in his mind that he's gone through half his extra air. It was time to head out to restock, then return to go deeper into sections he hadn't seen yet.
Suggested by AquariusDeviantArt It was kind of cool to draw one of these guys, this might not be the only time.