does everyone have the ability to dive deep with training>?
i think that everyone is capable to go to a certain depth, the depth to which they can equalize on one breath of air. or to the depth they can reach and still have enough air to get back to the surface...
a few years ago, when i was just starting to use masks/googles to see underwater (well i guess that would have been about 7 years ago...am i really that old :t ) anyway, my dad was trying to teach me how to clear my mask (a few minutes earlier i had someone kick me in the face and dislodge it..) the first time i tried, as i was taking the mask off of my face i had a huge wave of panic come over me, i thought that i was in serious trouble (actually in my mind i was a bit more expressive but those words are inappropriate for this forum :ban ) the next time i tried i was a little more "comfortable" as the water flooded my mask.
another example> the first time i dove to 20 feet, i was in a lake with about 5 ft visibility, after completing to easy check out dives, i swam out about 75 ft. (the water was deepest there..) and did a dive to 20 ft. after the first 2-3 seconds i realized that i was tha farthest from air that i had ever been, i also felt like my lungs were empty, (i know it was just the water pressure compressing the air, but it was still a scary feeling..) so, 0.0001 seconds later i was erupting at the surface..
and i thought what if i just cant dive that deep what if im not made for this, so i tried another dive just to try and figure out why i was scared (i was pretty stuborn, and the smallmouth bass had stuck its tongue out at me :t )
so, once i got to the bottom, i thought "hey there is nothing wrong with this, this is actually quite cool, i wonder if i need air, hummm... no i will try and make it back to shore without taking another breath" so, i made it back to shore without a problem (only about 25 meters)
so, what im trying to say, your body has never been in a situation like what you (or i) just did to it, so your body tells your brain "hey, are you sure we are suppose to be here>? why the heck are you doing this to me" thats what causes the feeling of panic or uncertainty. the second time down i told my mind that "yes, i will feel like i have no air in my lungs, but i will have some, so dont worry.." and i was fine,
so i guess in a very short form. the only thing holding you back is your mind (up to the point where you run out of air)
although there is a great part of freediving that is physical, your mind needs to be conditioned as well as your body.
sorry about the long post,
good luck..