In the Ramayana the monkeys gathered stones and rocks to build a bridge (setu) for Rama to get from India (Rameshvaram) to Lanka.

During a fight of Indra against demons they hid in the ocean. Sage Agastya drank it empty, the Gods could destroy the demons, then he filled the hole again with his urine.

That’s why a ‚bridge‘ had to be built, nobody wanted to swim in Agastya’s urine.

Read about Rameshvaram here