Deletion of Freshwater diving

Comment: to Underwater_diving#Diving_environment, where it is mentioned. I added a sentence about freshwater buoyancy to the target article and an RS book ref verifying. This is a plausible search term and the article has gotten 90 hits in the past 30 days, so a redirect is warranted per #KEEP
Stance: merge
Cited policy: Wikipedia:Redirect (WP:R)