Theory:

What exactly is the great bath?
great bath.jpg
 
The most remarkable feature in Mohenjo - Daro is the Great Bath. It consists of a large quadrangle.
A large swimming pool in the centre is approximately \(39\) feet long, \(23\) feet wide, and \(8\) feet deep, with galleries and rooms on all \(4\) sides.
It has a row of steps at either side and is fed by a well, situated in one of the adjoining rooms. Water discharged by a massive drain with a corbelled roof for more than \(6^t\)\(^h\) in depth. The Great bath had \(8^f\)\(^t\) thick outer walls, which successfully withstood the natural ravages for \(5000\)years. There were also arrangements for hot water bath in some rooms.
The Great Bath of Mohenjo-Daro is part of a large citadel complex discovered in the \(1920s\) during excavations at Mohenjo-Daro, considered one of the Indus Valley civilization's most important centres.
The bath is built of fine bricks and measures\(897\)square feet (i.e.) 83 sq meters. It is \(8\)feet lower than the surrounding pavement.
Granary Assembly & Hall:
According to historians, the people of Harappa used the Great Granary to store surplus amounts of food grains.
 
granary.jpg
There were two rows of granaries, and each row had six granaries.
Important!
Similar structure has also been found at Mohenjo-Daro.
All such granaries were constructed very close to the river bank for transportation.
A circular brick platforms were constructed for threshing grain. Many furnaces were also built to produce metal objects.
In the Indus Valley civilization, an Assembly Hall was discovered in Mohenjo-Daro, which the people of Harappa used as a public meeting place, a prayer hall, or a palace.
 
assembly hall of indus.jpg
 
It was a pillared hall with \(20 \)pillars and thick burnt brick walls.
Reference:
https://premierpoolsandspas.com/wp-content/uploads/2019/04/26869-zjxardkesg-1514960739-1024x538.jpg
https://www.harappa.com/sites/default/files/styles/galleryformatter_slide/public/collegebuilding38_0.jpg?itok=aE-ENN0v
https://www.harappa.com/sites/default/files/question/17_2.jpg