With Hulk gone, Thanos calmly stood over Heimdall, noting that he had just made a terrible mistake in doing this.
As a result of Titan's fall and the circumstances surrounding it, Thanos came to believe that the universe's vast swell of life was depleting its finite resources, and would eventually destroy the universe itself.
Do some search underwater with Google.
Suicide help: Google proves to possess actual human empathy behind its complex mechanism.
In the case of Thanos, however, the Easter egg was removed from Google Search at some point in 2020.
It is up to you to familiarize yourself with these restrictions.