Underwater breathing apparatus for a swimmer

An underwater breathing apparatus comprising:

• a mouthpiece consisting of a housing defining a chamber having a minimal volume and containing an inlet check valve and an outlet check valve sealing said chamber, air being constrained to flow only into said chamber through said inlet check valve and only out of said chamber through said outlet check valve, a conduit communicating between said chamber and a user's mouth, wherein breathing air is drawn from and spent air is expelled to said chamber;
• a flexible breathing tube supplying air to said mouthpiece, said breathing tube having a proximal end and a distal end, said breathing tube's distal end connecting to said mouthpiece through said inlet check valve;
• a floating air pickup member attached to said breathing tube at said proximal end, said pickup member consisting of a float, means for permitting an observer to monitor the breathing of a user of the underwater breathing apparatus, said means for permitting monitoring comprising a visible indicator consisting of a transparent air pickup tube extending upwardly from said float and terminating above water level, said air pickup tube containing a perforated ball constrained to bob in response to air flow therethrough, a right-angled conduit connecting said air pickup to said tube's proximal end, and enabling fluid communication therebetween, said right-angle conduit extending downwardly from said float and causing said breathing tube to be disposed substantially parallel to the surface of the water, whereby a user breathes through said mouthpiece while underwater, air supply to the user being constrained to flow into said air pickup tube, through said right-angled conduit and said flexible breathing tube to said mouthpiece, through said inlet check valve to said chamber, to the user's mouth and back into said chamber through said mouthpiece conduit, and is expelled by pneumatic pressure from said mouthpiece chamber into surrounding water, and
• wherein said right-angled conduit further includes a swivel means for enabling said right-angled conduit to rotate relative to said floating member, for avoiding entanglement of said breathing tube with said floating member, and for promoting stability of said floating member to prevent intake of water into said air pickup tube when a user exerts a lateral pull rather than a downward pull on said float.