Your first step is, of course, getting out of the sewers. Take the door with the EXIT label above it, near the computer that you have just downloaded the data from. Exit through the hole in the wall and turn right after you return to the main parts of the Burnley Sewers , towards the surface [Burnley]. Watch here a cutscene featuring the goons of The Mad Hatter, which one of the side missions is connected (you can find its description in a separate chapter of this guide).
As you have probably noticed, you are now in a closed location so, you need to use the Cryptographic Sequencer on the local control panel. You now need to play a bit more demanding version of the hacking mini-game. This is so, because there are several passwords available and only one of them is the correct one. (the above screenshot). Wait for the door to open and leave to reach the police parking lot.
You may now go towards the bank located in the Southern part of The Bowery. After you reach the location marked by the game, and get to the unguarded bank's rooftop. The rooftop's main access is locked , but you can find a weakened wall fragment shown in the screenshot. You, of course, need to use here the explosive gel.
After you have unlocked the access, climb down the stairs and raise the manhole into the Gotham Merchants Bank. First of all, select the disruptor from the inventory and use this gadget to disable the device behind the locked door. You can now use the Cryptographic Sequencer and solve the hacking mini-game of determining the correct password (the screenshot). Open the door to the bank's main area.