What was your exact profile? As to being dangerous yes it was. Had you ever been below even 60feet before? What size tank were you using? What is your SAC rate? What would the plan have been for deco? I'm guessing you do not know the answers to some of these. For that reason you should not have allowed that to happen. As a certified diver you and you alone are responsible for your dive plan. At the very least when you approached your recommended limit it was your responsibility to say stop. I suggest you read this thread:
http://www.scubaboard.com/forums/ne...ering-diving/283566-who-responsible-what.html
What you have just described is unforunately an all too common experience and it is due IMO solely to poor initial training in which you did not get the info you need to make an informed judgment as to the safety of such a dive. 53m is approx 170 feet to those of us who do not have the time or inclination to work it out in feet. As such a dive to that depth on air, besides risking extreme narcosis which it sounds like you experienced to a degree, is not on any recreational planner. I will therefore just assume (and this is by no means a recommended plan) a total bottom time of say 10 minutes. On V planner with a conservative setting of 5 this looks like this:
DIVE PLAN
Surface interval = 1 day 0 hr 0 min.
Elevation = 0ft
Conservatism = + 5
Dec to 171ft (3) Air 50ft/min descent.
Level 171ft 6:35 (10) Air 1.30 ppO2, 171ft ead
Asc to 100ft (12) Air -30ft/min ascent.
Asc to 60ft (13) Air -30ft/min ascent.
Stop at 60ft 1:18 (15) Air 0.59 ppO2, 60ft ead
Stop at 50ft 2:00 (17) Air 0.53 ppO2, 50ft ead
Stop at 40ft 3:00 (20) Air 0.46 ppO2, 40ft ead
Stop at 30ft 3:00 (23) Air 0.40 ppO2, 30ft ead
Stop at 20ft 6:00 (29) Air 0.34 ppO2, 20ft ead
Stop at 10ft 10:00 (39) Air 0.27 ppO2, 10ft ead
Surface (39) Air -30ft/min ascent.
Off gassing starts at 91.1ft
OTU's this dive: 16
CNS Total: 6.3%
57.3 cu ft Air
57.3 cu ft TOTAL
The numbers in the 3rd column are decompression stops that are required for a dive of this type. How much air did you have left when you came up? If something had gone wrong at 171 would either of you had enough air to get BOTH of you back up safely? If you do not know you had no reason to allow the DM to take you there and make no mistake you did allow him to. Those are also some pretty fast descents for a new diver.
Now if you did a bounce dive which is just going down and coming right back up it is even stupider and would look like this:
Surface interval = 1 day 0 hr 0 min.
Elevation = 0ft
Conservatism = + 5
Dec to 171ft (3) Air 50ft/min descent.
Level 171ft 1:35 (5) Air 1.30 ppO2, 171ft ead
Asc to 100ft (7) Air -30ft/min ascent.
Asc to 10ft (10) Air -30ft/min ascent.
Stop at 10ft 1:38 (12) Air 0.27 ppO2, 10ft ead
Surface (12) Air -30ft/min ascent.
Off gassing starts at 60.5ft
OTU's this dive: 9
CNS Total: 3.4%
You could do it w/o a safety stop but this is even more dangerous IMO. I would not attempt this dive type of dive profile. Too many things can go to crap very fast. The DM should have been disciplined yes but so should you be disciplining yourself. YOu should do this by getting more training and from different people. The first ones did not get thru to you what exactly it is and isn't that you should be doing as a new diver.