Measures of U3 and U6 (7.2% and 13.6% today, respectively) were no higher in Dec 1929 than they are now - maybe a quarter or half %% point higher or lower based on methodology.
I don’t think at all that we’re headed for GD2, but comparing the beginning of this crisis (4 months after the crisis exploded) to the absolute depths of other crises (12-36 months after the crisis) isn’t very useful or convicing.
There was no U6 in 1929—thats was a Clinton invention. In 1929, anyone who wanted a job but didn’t have one was unemployed.