Follow the passage. There's a cobra on the right just around the first corner. Kill it and continue.
After a little climbing and crawling, you'll come to a hole in the floor above the gate where you left the quad bike. Jump over it and continue along the passageway.
Kill another cobra ahead on the right.
Pick up the small medi pack on the ground nearby. Safety drop through the hole near the cobra and medi pack to land on the other side of the gold gate.
Press the button to the right of the gate to open it.
When you do this, 2 monkeys attack from behind. Shoot them and grab the save/power-up crystal if you need it. Then go through the gate, get back on the quad bike, and ride through the gate into the tunnel.
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