tread

What is the requirement for the 400M swim for a PADI DM and for the 15M tread? I know and understand the points and times but Im getting conflicting answers for both of the above. Are you allowed to use ANY gear for the 400M freestyle, even swim goggles? Ive heard both yes and no. What...

I am having real difficulty maintaining buoyancy for my lower body and it's coming in the way of my being able to swim well or tread water. I seem to sink in water and it makes treading extremely difficult and tiring. Do buoyancy swim shorts help in such cases, and are buoyancy swim shorts...