Even though, the government is continuously denying the fact that Ram Sethu is a man-made structure, Adya Jagadguru Shankaracharya Vedic Shodh Sansthan, under the leadership of Swami Gyananand Saraswati, has ascertained the exact time and period of the construction of Ram Sethu.
The Sansthan has released a research paper on Ram Sethu on the basis of extensive research of over 23 ancient scriptures, Vedas and Ramayana in different languages. According to the research paper, the Ram Sethu was constructed more than 1.81 crore years back (1,81,58060 BC) from Dhanushkoti in Rameshwaram to Suwail hills in Sri Lanka. As stated in Agnivesh Ramayana, Sri Ramchandra was 41 years old when he started the construction of Sethu on the ?Paush Krishna Dashmi? of Hindu calendar. Similarly, in the Valmiki Ramayana it is clearly mentioned in Chapter 22, that Ram Sethu was 1200 kilometers long and 120 kilometers wide. The Adhyatma Ramyana and Valmiki Ramayana give exact detail of the per day construction of the Sethu. The sixth chapter of Adhyatma Ramayana and 22nd chapter of Valmiki Ramayana state that on the first day the bridge was constructed 168 kilometers long, 240 kms on the second day, 252 kms on the third day, 264 kms on the fourth day and 275 kms on the fifth day. In the Valmiki Ramayana, it is also stated that the machinery was used for the construction of bridge.
Swami Gyananand Saraswati said he came to the conclusion that Ram Sethu was constructed in 1,81,58060 BC on the basis of mathematical calculations of Surya Sidhantha Astrology, besides collecting facts from Vedas and ancient scriptures. In the first phase of research we also found that Rameshwaram Jyotirlinga was consecrated by Lord Ram as a prelude to the construction of Ram Sethu between Dhanushkoti in Rameshwaram and Suwail hills in Sri Lanka. Adhyatma Ramayana and Prakaran Granth of Adi Shankaracharya written 2500 years ago also give exact detail of the geographical condition of Rameshwaram and Ram Sethu, in the period of Lord Ram. That is why Rameshwaram Jyotirlinga is also called ?Sethubandh? Jyotirlinga. The word ?sethu? or bridge is mentioned several times in the ancient scriptures. It is also mentioned in Adhyatma Ramayana that architect of Ram Sethu was ?Nal? who was the son of Vishvakarma.
All these evidences were collected from Valmiki Ramayana, Adhyatma Ramayana, Skandpuran Sethu Mahatamya, Patalkhand of ?Padampuran?, Srishtikhand, Agnivesh Ramayana, Kritvas Ramayana, Anand Ramayana, Adbhut Ramayana, Champu Ramayana, Brahmand Puran, Skandpuran, Anand Ramayana, Vayu Puran, Uttar Ramayana, Naradiya Puran, Shadangved, Arthved, Rigveda Samhita and Saur Puran.