I am new to forum here

Just got myself Avenger Seawolf. It is cool watch.

I am just wondering how this Helium Escape Vales work? Is it working in the same way like the rolex? Anyone have its drawing or video how this is working.

I regularly wear this into the work and sea. Just worried if some water or chemical may gets into the case from this small tiny hole.

Kind advise is appreciated.

It's not a 'tiny hole', but a valve, & it's there to release Helium gas that will ingress into the case at a certain pressure. The watch remains 'waterproof' but the helium invades the space inside the case where the movement is as pressure increases. He, will cause no problem to the watch movement, but will expand during 'decompression' and lilkely blow off your crystal, which will cause a catastrophic ingress of seawater into your case/movement thereby destroying your pride & joy.
So therefore, your watch has a Helium escape valve which will protect your movement by expelling Helium gas as the pressure of your ascent reduces & you return to your desk, safe, & ready for another day.
Your watch is rated at 3000m, so please don't worry about your little hole in the caseband, and enjoy the feeling of wearing one of the most pressure proof watches commercially available, in the world.