Maybe if you operate like a dumbshit. It's pretty easy to safely work with metal as long as you care to do so.
From some statistics, it has been shown that the underwater welder’s life expectancy is about 35-40 years
We're going to need a source on that.
Why is that?
Welders are exposed to a heavy industrial environment on a daily basis... Harsh chemicals, metal fumes, grinding dust. None of these things are healthy to be around.
In these times usually welders work with fume extration systems.