That Guy Who Likes The Water Levels

In a world with a system and dungeons. The water levels are the bane of hunter's existence. Similar to the hated water levels in video games. Though just like real life weirdos always exist. Our protagonist, an expert in water levels, thrives in these 'Uncharted Waters', reaping rewards that no-one has ever received. Will he thrive and reach his goal of becoming a hero or would the surface forces stop his ascent for his special physiology?