
My wife lost air at 16m in Moalboal — sharing this because it might help someone someday
My wife and I are both AOW with around 50 dives. Not super experienced, but definitely not brand new divers either.
This happened during our second dive day in Moalboal.
At around 16m, our guide was right next to my wife, almost shoulder to shoulder, showing her a fish. I was maybe two meters behind them.
Then suddenly I saw from behind that something was very wrong.
Her body language changed instantly. She looked like she was choking, struggling, trying very hard not to panic.
She tried breathing from her regulator,no air!
She switched to the alternate second stage — also no air!
Because the guide was literally right beside her, she managed to grab his alternate regulator almost immediately. He helped purge it and stop her from inhaling more water.
We then made a controlled ascent together.
Honestly, this was the part that really stayed with me afterward:
People always say “just stay calm” in emergencies underwater.
But she actually WAS trying to stay calm.
The real problem is that when both your primary and backup second stages suddenly stop delivering air at depth, without warning, the margin for error becomes incredibly small.
If the guide had not been directly beside her at that exact moment, I honestly think the outcome could have been much worse.
At first, after we surfaced, even we started doubting what happened a little, because both second stages seemed to work again on the boat.
Some people on the boat wondered whether it was panic or a breathing issue.
But later our guide confirmed that underwater he had also tried pressing purge and noticed there was no airflow. He apologized and agreed there was definitely a gear issue.
What surprised me afterward was how deeply it affected my wife psychologically.
The next day she tried to dive again, but once she was floating on the surface she started breathing rapidly and couldn’t descend at all.
Later she told me the fear of drowning just came flooding back instantly, completely uncontrollably.
After that incident I started reading a lot more about regulator failures and rental gear maintenance.
From what I learned later (and discussed with divers/GPT), the two most likely causes seemed to be:
1.tank valve not fully opened
2.first stage regulator failure
Apparently a partially opened valve can still seem normal at shallow depth or lower air demand, but fail once you go deeper or start breathing harder.
I also started looking into regulator servicing afterward.
From what I found, many regulators are recommended to be serviced about once a year or every 100 dives, depending on manufacturer guidelines and usage.
And servicing is not just “cleaning.”
It usually requires service kits, trained technicians, special tools, replacement parts, tuning, and proper testing equipment afterward.
Even the service kit itself can cost around USD 70, not including labor.
That honestly made me think a lot about rental gear in busy dive destinations.
I’m not saying every dive shop cuts corners, but realistically, in high-volume diving areas — especially in parts of Southeast Asia — I personally find it hard to believe every rental regulator is always serviced perfectly on schedule.
That experience completely changed how we approach rental gear.
Over the next few days we became MUCH more strict about checking equipment before every dive.
And honestly… we started finding all kinds of issues:
leaking SPG hoses
leaking BCD inflators/dump valves
unstable pressure gauges
very old regulators
One setup showed only 175 bar and the regulator breathed inconsistently during testing. The guide initially said it was fine.
After we insisted on changing it, the replacement showed 200 bar and breathed normally.
That honestly shook my confidence even more.
I’m not posting this to attack Moalboal or dive shops there. We still met many good people and completed the trip safely.
But this experience completely changed how seriously we inspect rental equipment now.
Please check your gear carefully, even if everyone else around you seems relaxed about it.
Stay safe everyone.