A dramatic and atmospheric square 1024x1024 image suitable for an audiobook cover. The central focus is a partially submerged, ancient Greek trireme sailing through turbulent, deep blue and grey ocean waters under a stormy, overcast sky. Dark, ominous clouds are breaking slightly to reveal a sliver of dramatic, low-angled golden light illuminating the crest of a large wave crashing near the ship. The trireme itself is weathered and aged, with visible carvings suggesting its historical significance. In the background, barely visible through the mist and spray, are jagged, imposing rock formations that hint at a treacherous coastline. The overall mood is one of impending danger, mystery, and epic adventure, with a color palette dominated by deep blues, greys, and a touch of ochre/gold from the light. The composition should be dynamic, with the ship and wave creating a sense of movement and tension. The aesthetic should be professional and evocative, suggesting a grand historical thriller, without any text.