Article published in 1989 in Portugal with the concept of a space program fully based on ocean settlements. Ocean colonies as the first step for outer space colonization was originally presented in 1988 in Houston under the title "Expanding the concept of Space Program" that addressed the need for the creation of a new "industrial ecosystem" that would enable human expansion out of earth.

1. Revista Sábado Vol. 1, Nº 59
“A Astronáutica em Portugal”
5 de Agosto de 1989
Autor:
Dinis Afonso Ribeiro