Opera House - Flooded Basement - Secret #3 (Silver Dragon) and Relay Box
After opening the trapdoor in the stage and dropping in, as shown in the previous section, Lara finds herself in the flooded basement. Tread water below the open trapdoor, with the sandbag in front of you, to get oriented. Go through the doorway on the left.
In the next room, turn left again.
Continue forward, wading through waist-high water until you come to a short flight of steps leading down. Dive down and follow those steps into another room...
...where you can surface for air.
In the far right corner of this room, just below the water's surface, is a small opening. Swim inside...
...and follow the narrow passageway to SECRET #3, the Silver Dragon (20)...
...plus 5 sets of Uzi clips (21-25) if you found the other secrets in this level. Roll and swim back to the surface.
NOTES: If you don't have the UZIS yet, you'll receive the guns plus 400 Uzi rounds here. If you found all secrets in the Venice levels, the "Codex of Italy" achievement/trophy will unlock. If you missed the Gold Dragon earlier, you'll have another opportunity soon.
On the opposite side of this flooded room there's a raised area where the water is very shallow. Flip the switch there...
...to open a door on LEVEL 3 of the main auditorium.
Swim back the way you came to the room with the waist-high water.
Wade forward and then turn right into the room with the trapdoor and sandbag.
Turn left, so the trapdoor and sandbag are behind Lara. Then swim down and forward, right...
...then upward to surface in the next room.
Climb out of the water on the small ledge. Pick up the RELAY BOX (26).
Then climb the ladder to the door you opened with the last switch.
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