What material was used under the floor and corners of the Great Bath?

What material was used under the floor and corners of the Great Bath?

عظیم غسل کے فرش اور کونے کونے کے نیچے کون سا مواد استعمال کیا گیا تھا؟
Explanation

Tar (Tarkol) was used to waterproof the floor and walls of the Great Bath in Mohenjo-Daro.

This shows the advanced engineering skills of the Indus Valley Civilization.