No weights just leg power. No line, head down, fist pointing the bottom. You become negatively buoyant( you sink) at 60 feet, with a 3mm on. No problem with sinuses and for the ears you compensate by pinching your nose and blowing trough it with out letting the air come out. Every 33 feet you have one atmosphere so at 80, if you count the atmosphere of the the earth, you have more then 3, water is 800 times more dense then air.