Yeah sorry, nub is a stupid iteration of noob that stems from newb which is the child of newbie. I need to stop using it
On the sub, new guys were NUBs.
Non
Useable
Body.
In other words, they were breathing our oxygen (a concern on a sub), but providing no useable output.
They had to qualify on anything, before they could operate it.
Done rambling. Noobs use oxygen, but no big deal now.