Translation:Afterwards he climbs up the ladder.
is the "hoch"in that German sentence part of an expression, or does it really stress that the person is climbing high up the ladder? Duolingo rejected my answer in which i added the word "high", so i think it is the former, but it feels weird so i'm asking you guys for a confirmation :)
'hoch' here tells you in which direction he's climbing. He can either climb the ladder hoch or herunter, each has possible synonyms, where hoch means upwards and herunter means downwards, just like up and down would in english.