Hinduism: from where did Bhagavan Ram and his Vanara sena brought floating stones that are used in Ram sethu?

i believed .dekho sraddha man se hoti hai manne wale mante hai apni srddha se .jiske man sraddha nhi uske man me jabrdasti sraddha jagaya nhi ja skta apni soch ke uper hai wo chig dihke me nhi.