The HUET courses I did 25 years ago were excellent when I had occasion to travel/work out of the company AS355 as 'SLF'
Blindfolded and one door randomly locked so you had to crawl over the seat to the other one if your door wouldn't open. But it is pretty easy in a warm water swimming pool compared to the ocean and a real helo ! After a few times, you can do it more calmly, but it is a stretch to expect untrained people to remain calm and egress successfully.