The next thief is inside the taxi shop, but there don't seem to be any guards inside. After a little trap, Murray and Sly fall down into some secret area, where they get separated and unable to speak with Bentley. Your will control Murray first, so go up to the wheel and keep turning it to raise a platform, but you can't go any farther because of the spinning blades.
As Sly, go forward and across the two wooden ledges, then climb the rope to your right. Go along the next wooden ledge and jump on the switch for the door. Make sure you have your Thief Costume equipped, then slow down time and go through the doorway.
You need to slow down time and make your way across the platforms in the water, making sure you don't land on the barrels with flashing lights, as they are bombs. Do it again for the second time, then bounce to the switch and use Slow Time to get through the door.
There's another rushing waters section here, making sure to use the spire jumps in the middle to replenish your special meter. Once you get to the end, yougm need to use Slow Time to climb the chain and land on the switch, then use it again to get through the door. Use the sword to break the gear, allowing Murray to continue.
As Murray, drop down and jump on the platforms to get to the next area. There are some guards here, so either stealthily take them out, or just punch your way through them. Once it's clear, head over to the wheel to try and turn it, but some cannons will start opening fire. You'll be in your own cannon, so shoot the cannonballs and when it's clear, start shooting the cannons. Turn the wheel all the way, then go until you come to some more spinning blades.
It's Sly's turn again. Before you make your way across, ride one of the crates to the bottom platform for a Secret Sly Mask. Make your way back across now, grabbing the rope on the other side, then sliding down to the next area. Here, you can't step on any coins, as this will alert the guards.
Make your way to the first path's end, then use the center object to get to the crates. The pillars ahead will crumble and cause noise if you stand on them too long, so either make use of the Slow Time move or just jump off as soon as you land. Once you get to the other side, use the Thief Costume's sword to destroy the gear.
Back to Murray now, so break through the trap and defeat the guards ahead. Drop down to the platforms in the water and make your way across. Bounce your way to the next area and defeat the guards there, then go to turn the wheel to have to take out more cannons. Once they're gone, turn the wheel.
It's now time for the final push with Sly. Make your way across the platforms, either trying to avoid the explosive barrels or using Slow Time. As you near the ship, Bentley will chime in and say that it's sinking. You need to use Slow Time to make it all the way up the sinking ship. Once you start climbing vertically, you will probably need to reactivate Slow Time, so do that and make it to the top. You'll have to do one last thing, which is to hack the music player, which when done, will finally complete the mission.
