If I remember correctly the passage is in the north. You have to dive underwater by looking almost straight down (PgDn), and then move forward (arrow up). The 0 is only for jumping and climbing.
The only reason I can think of that you're moving backward is that you're being attacked by fish and they push you back. That is unless you've remapped your keyboard in the game options. Check those to make sure they haven't changed.
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