Met up with Richard on a clear, beautiful spring morning. It was slightly cool (53) and humid (64%), but just right for a run. Richard was gone all last week on a diving expedition to the caves of Yucatan peninsula. These caves have a unique feature called a halocline which is vertical gradient between the inland fresh water and the ocean. The Maya apparently believed that this gradient or interface was the veil between mortality and the underworld. Richard said that in ten dives that they maybe explored 1 percent of the caves. Some caverns were big enough to fit a 747 while other passages were so small that a diver could barely get through with his tanks. He said the water was so clear that at times it looked like other divers were just floating in the air. It sounded like quite an adventure. We ran and walked together for about three miles and then I took off towards the temple to run a course similar to Saturday's run except I took the turn off to the golf course instead of going all the way to the mouth of American Fork Canyon. Felt a little tired at times, but no aches or pains to speak of.