
First, set things up for a smooth run. Drive the speedboat through the small doorway into the DARK, LOW-CEILINGED ROOM with the button. (If this door is still closed, just pass through the wide opening at the top of the wooden ramp, and the door should re-open.)

Position the boat just in front of the button, facing out toward the left side of the wide opening and the steep ramp leading up to the glassed-in walkway.

Press the button...

...to open the EXIT DOORS.

The timer doesn't start until you cross the threshold, so there's no need to hurry yet. Hop into the boat, and save the game. Then, if you don't reach the exit on the first try, you can just reload and try again, rather than having to drive all the way back and reposition the boat.

When you're ready to go, press Forward + Action to gun the engine and take off over the wooden threshold. This is when the timer starts.

Keep holding Forward + Action for turbo speed as you cruise up the steep, wooden ramp. (As you race up the ramp, you can lightly tap the Left/Right controls if necessary to stay on course, but if you lined up the boat correctly before takeoff, you won't need to do much.)

Maintain speed as you crash through the glassed-in walkway...

...and land in the canal below (where you hopefully destroyed those gondolas earlier).

Continue straight ahead under the stone bridge.

Ease off the Action button as you steer left then immediately right, into the narrow passageway with the raised metal gates at each end (O and U on the map).

Hold Action again for a speed boost as you race through the narrow passageway. At the end, release Action, turn hard right...

...then press Action again to zoom past the CONCRETE DOCK...

...then the underwater mines (hopefully you detonated them earlier), and on to the exit. Brava!
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