the.com/snorkeling
swimming with your face in the water and somehow calling it a vacation activity.
means Swimming at the water's surface while breathing through a tube so you can keep your face submerged and watch the fish without lifting your head.
from From the German 'Schnorchel,' the air-intake tube that let WWII submarines run their diesels just below the surface. English borrowed the word, sanded off the menace, and handed it to tourists in rubber masks — the same breathing-pipe principle, now aimed at coral instead of war.
ancient gearAristotle described divers using breathing tubes in 350 BC
sponge originsearly snorkels came from hollow reeds for harvesting sponges
tube limitsnorkels stay short because long ones cause suffocation
fish blindnessfish often ignore floating humans as harmless drifting objects
breath physicsexhaled air pools in the tube, raising carbon dioxide risk