When investigating engineers tore away a wall, they discovered gaping holes in the cement undersurface as well as other alarming examples of shoddy workmanship.
But Author White's novel carries an undercurrent, nowhere found in Lewis' books, of those acute undersurface tensions detected by the Lynds.
When it sank again, one of them swam under it, scraping its tender undersurface and triggering a reflex action of its tail that shot it up to the air.