Hello and welcome to our community! Is this your first visit?
As a lifeguard trainer (both pool and beach lifeguard), I would agree with the majority of above, except for the 'unigrip method ', which I also have not heard of and with most techniques will have to be well and often practiced to have hopes of success.
I used to use a newspaper clipping about a young teacher from the Midlands, who was in a near drowning incident in Sharm, apparently recovered, flew home and died five days after the incident to illustrate secondary drowning.
Well done for taking action as it's remarkable how many people think that it's someone else's job and I hope that the rescued have had a happy outcome.