Conversation so far:
When did the Golden Age begin?
Aquaman's first origin story was presented in flashback from his debut in More Fun Comics #73 (November 1941).
What happened in #73?
The story must start with my father, a famous undersea explorer.
Who was his father?
if I spoke his name, you would recognize it.
What was his father's name?
CANNOTANSWER.

Question: What did his father do?
Self-contained rewrite: What did Aquaman's father do?