The Temple in the Sea, officially known as the Sewdass Sadhu Shiva Mandir is a Hindu mandir in Waterloo, Carapichaima.  Sewdass Sadhu was born in 1901 in present-day Uttar Pradesh, India and was the original builder of the temple. Between 1845 and 1917, through the establishment of a labour indentured system, many Indians migrated to Trinidad and worked as indentured labourers in plantation sites across the country.   Sewdass Sadhu was the son of Boodhram and Bissoondayia, indentured labourers at the Waterloo Sugar Estate in Trinidad.  Sadhu traveled to Trinidad on the SS Mutlah when he was 4 years old. He was a devout Hindu who chose to live as a sadhu. He died in 1970.

Sewdass Sadhu constructed the original temple in the Gulf of Paria in 1952. In the 1930s, Sewdass Sadhu, an indentured labourer, built a sewalla, a small temple dedicated to Shiva, on an estate owned by The Tate and Lyle Sugar Company by facing the Gulf of Paria. Five years later, the estate management requested Sadhu to remove the temple because it was not his land, but he refused. Sadhu was sent to prison for 14 days and fined 100 pounds for refusing to remove the temple and it was destroyed.  After his release from prison, Sadhu built the temple with the belief that colonial powers had no ownership of the sea. In 1947, Sadhu began riding a bicycle to transport stones, cement, and sand in his bag from the island and unloaded them at the coast of the island to extend the island borders offshore. After the creation of the rocky pathway, Sadhu built another temple in the Gulf of Paria. The rocky pathway into the gulf and the temple were completed in 1952. The Temple in the Sea is approximately 20 kilometres from Traum House Lodge.