Scuba diving can be a dangerous activity if you do not have the correct equipment or do not have the necessary training. You are relying on your instructor or the company that organised the dive to take care of this for you. If they have been negligent, the worst can happen, and you can end….
"If you've been injured through no fault of your own you could be entitled to compensation. If you're unsure if you could claim, I recommend you call Accident Advice Helpline."