I'm getting pretty old so I have experienced multiple waterfall projects. The comic should be

You want to go to mars You spend 3 months designing a rocket You spend 6 months building a rocket You spend a month testing the rocket and notice there is a critical desing flaw.

You start over again with a new design and work on it for 2 months You spend another 6 months building it You spend 2 months testing

Rocket works fine now, but multiple other companies already have been to Mars, so no need to even go anymore.