float.

 Rama worships the god of the ocean, Varuna and requests him to make way. When Varuna does not appear before Rama, Rama starts shooting various weapons at the sea, which starts drying up.

A terrified Varuna pleads to Rama. Though he refuses to give way, he gives Rama a solution. He tells Rama that Nala, the son of Vishwakarma - the architect of the gods, is amongst his vanara army.

Varuna suggests that Rama construct a bridge across the ocean to Lanka, under the supervision of Nala.

In some versions, Nala is said to have the power to make stones float and, thus, easily makes the sea-bridge.

In other versions, another Vanara called Nila is also said to have this power and both Nala and Nila are described as builders of the bridge. Known as Adam’s Bridge.

It was built in the Span of Five days:

1st day : fourteen Yojanas

2nd day : twenty Yojanas

3rd day : twenty-one Yojanas

4th day : twenty-two Yojanas

5th day : twenty-three yojanas.

Length and width of Rama Setu: Adams bridge:

The celestials and Gandharvas, the heavenly musicians saw Nala's bridge, having a width of ten yojanas and a length of hundred yojanas and which was very difficult to be build.

two more additions to this was very interesting.

While the bridge was being built It is said Rama too picked up a stone and put in the sea but that did not float. Rama saw Hanuman looking at him and smiling. so he asked him why did that happen Hanuman smilingly said when Rama only leaves the stone how then could it float. we already know that each stone was inscribed with Rama Nama.

People ran to Ravana and said The Rama army had succeeded to built a bridge and the stones were floating. to re assure them Ravan said even i can do it and threw a stone into the river which floated. Ravan knew that it did so because he had taken an oath on the name of Rama that this stone should float so it had floated.