Ok. yesterday was doing a deep dive check off. air temp. 55 degrees water 45-40 degrees. Had on a 7m full suit, hood and gloves. 80 alum. tank 2800 psi and 30lbs of weight. also a small poney (agency I work for requires on deep dives). I am a pretty new diver have but feel comfortable with my equipment thus far but have never been below 50' so I was a little nervous about this deep dive. The original plan was to drop down the wall and then swim around a boat and car thats at the bottom and just see what it's like kinda thing, showing my instructor I could do it in a controled fasion and without freaking out. Like I said I was alittle nervous goung out of my comfort level and let my instructor know my concerns. I felt better decending and acending from an anchor line rather than the wall and he said no problem lets do that and I'll be beside of you and let me know if you get uncomfortable and we'll go back up. Of coruse he was like dont do anything your not comfortable with but I really trust this guy and knew if I didnt feel comfortable I was going back up. So any ways we descend I have a computer on my wrist and go down with ease and comfort. As I'm watching the depth get deeper I feel good and comfortable at about 70' My weight just changed and felt so heavy that I actually had to hold alittle tighter to the rope. Then when we got to the bottom 95' had to put small amount of air into my BC to be able to stay off the bottom and then swam around enjoying my dive in comfort and ease. Now tank at about 1500psi and started the slow acent to the safty stop. All was going well until I got above 60' and I started just going to fast to the top and realized I was passing everyone in the class but the anchor line is'nt stationary any longer so pullung on the line only pulls the rope up so I dive down and grab the wall which is about 10-15' away and hold on to it and let out the air I guess I should of out of my BC of course my instructor was by me by then, it all happened really fast. And I swam back to the line and continued to my safty stop and then to the surface without any further complications. above the surface after everyone giving the ok sign my instructor and I talked on the swim back to the bank. About the changes in pressures and bouyancy. But how do others control your ascent and decent I cant imagine yet doing that with out a referance point ie anchor line or what have you. But could this of been dangerous? What would a more experinced diver do in the situation I was in going down and up? I feel good about the dive and actually looking foward to the next check off comming up. But just wanted to share my experiance and get some input or advice.