No it's not! Just gear up and get in the spring water. It's twice the temperature it was last night in the caves! I'll be in the caves the next 3 days!
Not always so easy. When I did my Intro class, almost 2 yrs ago in Feb. Our equipment would freeze in the back of the trucks overnight, & then we would have to thaw it out first. Regulators & inflators kept sticking. But then again, that spring water did feel like bath water, once you got in.