In 1887 Depelchin was sent back to India. This time, his mission was the establishment of a high school in Darjeeling, a town in the foothills in the Himalayas in the North Bengal. He was already 67 years old. But, with characteristic punctuality and efficiency, he began on 10 January 1888, the day he arrived in Darjeelling - and only six days after he came to Calcutta from Antwerp. He found a bungalow to temporarily house the new school in a place called Sunny Banks and it opened on 13 February with the name of St. Joseph's School. The first class had 25 students, with Father Depelchin as their first Rector. He also served as the pastor for the town.