I realized that its spur had just bumped a block of ice. It must have been a faulty maneuver because this underwater tunnel was obstructed by such blocks and didn't make for easy navigating.
Comprendí que el espolón del Nautilus acababa de adentrarse en un bloque de hielo, a consecuencia probablemente de una maniobra errónea, pues la navegación no era fácil en aquel túnel submarino obstruido por los hielos.