No I agree there are no big walls in Grace Bay but there is a very nice mini wall that drops down to about 100-120 ft. The diving is beyond the barrier reef and offers very nice coral formations. As for the big life...well you are no more likely to see the big life on the big wall...I have dived extensively all around the Provo area in the last four years that I have been working here and can have good days & bad in days in all the areas. I have taken numerous beginners (and certified divers) in Grace Bay and have seen sharks, eagle rays, turtles and even had a few dives with Jojo the Dolphin...one particularly special occaision when I had an 11 year old girl on her first try dive. Also not forgetting the time last year when we came across a pod of 7 dolphins including mother & baby and we were fortunate to get in for a snorkel with them for about 30 minutes. Yes the walls are spectacular and not to be missed but on a good day, Grace Bay rocks...ask any of the dive guides who have the pleasure of working for the dive centres that include it in their itinery.