I recently completed two fun dives with Calypso Beach and Dive (New Years Eve, 2019). Whilst the dives for the most part went really well, on my second dive it turned out that my gauge was broken, because when we were still at depth (roughly 18m) and my gauge read 50 Bar, my tank had completely run out of air. Lucky I was not far from the dive instructor and did not panic, I swam over to him and signaled I was out of air. I shared his air and we were able to safely ascend.
This was a rather scary thing to have happened, due to faulty equipment, and when I made the dive instructor aware he just laughed about it, and I never received an apology from anyone. I sent an email to the dive school and told them about the incident, just to make sure that this doesn't happen to anyone in the future, and I never received a reply unfortunately. I would like to think that they have since checked that specific piece of equipment, but without having received any emails back, I am not to know.
This sadly put a damper on what could have been a wonderful day of diving.