In this case the shores of the lagoon would be surrounded by two inclined ledges, one beneath the other, and both abruptly terminated by subaqueous cliffs.
"Coral-Reefs"
Darwin, Charles
All the others would have watched this spectacle for a while, interested in the maternal and filial traits thus exhibited by a subaqueous creature, but while they stood looking into the water, something glanced before their eyes, and glided with a plunge to the bottom.
"Popular Adventure Tales"
Mayne Reid
It is no doubt of volcanic origin, belched out of the bowels, and on to the surface, of the earth, by the sulphurous upheavings of subterraneous and subaqueous fires, and cooled and solidified into monstrous masses by the gelid currents of the deepmost waves of the most ancient of former oceans.
"Australia Twice Traversed, The Romance of Exploration Australia Twice Traversed. The Romance Of Exploration, Being A Narrative Compiled From The Journals Of Five Exploring Expeditions Into And Through Central South Australia, And Western Australia, From 1"
Ernest Giles