As others have said,,,, Relax!! Dont wear yourself out, Dont think you can swin 1k to the dive site then dive,, rest, Ive seen many divers try to swim on the surface to a spot,, very tiring then try to dive it,, now youre exhausted! And your breathing rate is very high now, next panic! Relax, Think, breathe slowley and enjoy the sites!! Do not dive Deeper than you are comfortable and certified for! Keep close watch on your gauges