Sewer

Sewer
Sewer (known as TZT砲 in Japan) is a setup that uses three consecutive T-Spin Triple attacks. After the setup, it sends 20 lines to your opponent which is enough to fill their field with garbage. This setup is not commonly used is because it makes the assumption that your opponent disconnected their controller in order to work. It is invented by Yuu.

First Bag
One can build Sewer if their opening bag has a late I piece while they get the S/J pair before the Z or the Z/L pair before the S.

Completed first bag:

Second Bag
In the first loading method, L can be spun in even after O and Z may be placed.

Third Bag
One will need to spin in the Z piece. Some examples of how the third bag may be stacked:

Fourth Bag
Place J and L like below and add an overhang to make a T-Spin Triple.

British Sewer
British Sewer (named as TZT砲改 (romaji: TZT Hō Kai; lit.: TZT Cannon Revision)/TZT Cannon 2 in Japan) is a setup invented by Japanese player to make a "Sewer-like" build where the only piece dependent part is at the very first bag where S and I have to come early while Z and L have to come before O. In a nutshell, this was  supposed to be made as a refined version of Sewer. After successfully stacking the first bag, the continuation of this setup has 100% build chance up until 4th bag, where the whole setup ends.

First Bag
As mentioned earlier, S and I have to come early and Z and L have to come before O.

Depending on the bag, the mirrored setup might be necessary to be stacked instead.

Second Bag
One is always able to stack their second bag like below.

Third Bag
Again, one is always able to stack their third bag like below. Even if I piece comes before Z on the third bag, Z could still be inserted in place via SRS kick.

Fourth Bag
The build ends with a T-Spin Double with another 100% build chance. L and J could be stacked in one of 2 ways.