What is the most important engineering work you have been involved with so far?

Question: What is the most important engineering work you have been involved with so far?
- Keywords:
  project,
  work
Asked by zest021ear to Olga, Madhumidha, Connor, Canice, Aruna, Anthony on 9 Mar 2020. This question was also asked by join021ace.
- Aruna Chandrasekar answered on 9 Mar 2020:
  
  During my masters I was involved in building a self-sustained toilet for rural communities in India as a part of The Bill and Melinda Gates Foundation project. This was the most important part of my career so far, both professionally and personally.

Question: What is the most important engineering work you have been involved with so far?