For liability reasons, we had to wear a chainmail shark suit in the tank over our wetsuit. I would without hesitation go in without one. I never felt threatened, and like being with the piranha, you had to pay more attention to confusing or frightening the animals rather than worry about them attacking you. Only once, when getting over the tunnel that runs through the middle, did I feel I was at risk - because I don't think either of us (me or shark) saw each other coming. But it was great, and we would typically spend some extra time looking for teeth. I even have some here on my desk now. The irony is that with those sand tigers, their teeth are so narrow and sharp they would still get through some of the chainmail, IMO not IME thankully
And the transition to a desk job was very difficult (including added weight). But there were several issues there that made the "work" very enjoyable but the "job" miserable. I guess that is true of every job.