My son (10) and I are going into the shark cage at the shark encounter in Sea World. I'm not scared of the sharks, or the water, or the cage, and maybe a little the wet suit...what's really bothering me is the SCUBA helmet. I'm alittle clastrophobic and I'm worried about freaking out when the helmet goes on.

Has anyone ever done this? How big is the helmet? I just don't want to freak at last minute and blow by dh's money. Thanks!