Hell, as modern many Christians imagine it (eternal place of torture amidst fire and flames for those that do not accept Jesus) does not exist in Judaism.

There were/are varying interpretations...

From the Torah itself, you have Sheol, which is basically like a dark and dreary cave, a place of forgetfulness, which everyone goes to, and your soul/consciousness just kind of slowly fades away into nothing.

Relying more on the Talmud, you also have Gehinnom, a place of punishment for sinners which can be a place of fire and brimstone, or it can be more like a place for reflection and review of your sins... usually your sould only goes there for 12 months.

Gehinnom, as a concept, largely came about after the Second Tenple was destroyed in 70 AD... Christians would use parts of this idea as a basis to make their idea of Hell worse and worse as time went on.

tl;dr Isaiah was written hundreds of years before the New Testament existed, probably about a thousand years, maybe more, before the modern Christian Hell was formulated.