This is probably the same challenge with AI. The answers are well written, but you cannot guarantee their validity unless you do the approximation and have an understanding of the subject.
In this particular case, it is not planning the dive. It is just parsing available texts on the subject (and I wonder how much of that was scraped from right here on SB) and is giving you the statistically most common answer that fits your prompt.
What you should do is try the different prompts. Like ask for the least worst rebreather to buy, to list rebreathers from best to worst, etc., and see how those compare.
That's probably too simple, add clauses like "at high tide" or "in waters not known for high incidence of shark attacks" to make it real fun.