It is the magic of moving within a three dimensional space where your feet are usually limited to the carpet and your head to the middle layer of the room. While wreck diving, these restrictions of gravity are lifted off you, you can move to any direction you might fancy, position your arms and legs where ever you like, be up, be down. All just a matter of breathing and a bit of fin kicking. The essence of freedom, in a space where it was impossible in the past and that is inaccessible to most even today.
Free yourself, DIVE!!!
See divers doing exactly this right here in the gallery.