It's not recommended for a sport diver to go below 130 feet due to the partial pressure of oxygen being poisonous when it reaches the equivelant of 100% (5 atmospheres as there is about 20% oxygen in the air). Also the effect of Nitrogen narcosis can make your decision making erratic. It's not an exact science as to what depth an individual may succumb to this but 130 feet is a good guage of where you are relatively safe as long as you are obeying all the rules of training and you and your buddy are not irresponsible. Any deeper and you would need to mix gases and should get more specialised training.
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