The program reached its apex with the installation of the SEST in 1987 (Swedish ESO Submillimetre Telescope), the only large submillimetre telescope in the southern hemisphere, which was a combined project between ESO and the Swedish Natural Science Research Council.
A program telepítési csúcspontja a Šest 1987 (svéd ESO Submillimetre Telescope) volt, mely az egyetlen nagy Submillimetre Telescope a déli féltekén, ami egy vegyes projekt az ESO és a svéd Natural Science Research Council között.