Your essay should include Malfunctioning equipment, oxygen toxicity, pulmonary embolism and of course marine life in general. To make a good solution explain the technological advancements which have been developed to prevent these risks. Clearly explain with analysis while also find studies and statistics. best of luck with your essay
You could talk about the process of SCUBA diving, like what he divers actually do, the equipment, the dangers the rewards (yah I'll give you credit for this part of the idea shezza) and you could always have them watch a video on it first and then quiz them on it, I always thought SCUBA diving was pretty cool when I was younger.