We've been to 155 on a 120cf steel in Cenote Angelita. We dropped down to 90 feet and stayed there for 2 mins, looking at the cloud from above. Then we dropped down below it. We were at 155 for 1 min 8 seconds, then started spiraling back up (Cenote Angelita is a pit cenote). We were below 100 feet for 6 min, 7 seconds. Total dive time was 27 minutes. We dove thirds even though this was not an overhead environment. Other than being dark, it didn't feel any different to me. I'm sure I was narced to some degree, but it did not seem to have any significant impact on my ability to think (I do math problems in my head to see how narced I am).