Hi Steve!! :cheering:
Farst I say, my English level is low.
Therefore, I can use only a direct word.
So just opinion at US Agencys.
But, the C-card of Agency can not use every area and country.
To be necessary is that cave diving can be done. :58:
There is a double tank class in Japan.
Because, a few Japanese divers use a double tank.
Most Japanese divers don't know how to use a double tank.
I think that it is good to establish a side mount class, too.
A side mount is very easy. :rock_band
A balance of side mount is very good.
Most divers don't know because they has never used a side mount.
When a side mount is known, you will know a new cave.
For example,
You will know a new entrance at cow spring.
You will know a new passage at Peacock, Devil's. :banana: