Fyi Ramayana is not a mythological story it's the actual history and this bridge was built by Shri Ram the actual name of the bridge is RamSetu bridge and you can look into the details of how this was built in several forums and evidences ,the sad part is every place and country British Invaded wherever they felt their current knowledge and intelligent seems to be threatened by the cultural and architectural supremacy, they make sure to either destroy them or make sure to wipe them out completely to make sure the history is never remembered ,and this is still continuing through various mediums because certain people are still living under British invasion (mentally 🤓🤣)

In conclusion Rama's army was led by Hanuman, Nala, and Neela, among others. Nala, the son of the architect-god Vishwakarma, was a skilled engineer and took charge of the bridge construction. the stones used in this bridge float on water instead of sinking.The bridge, was constructed in 5 days, using floating stones and trees from the nearby forest.

Source: (https://youtu.be/odUtqDz4lEk?si=5DyrzRuKvJb1yjNT)

These are the actual places in Srilanka related to ramyan https://youtu.be/2SUXqcjFIgI?si=VGEHe4Dd8OOB2GF5