The word ECHO rendered as massive brutalist typography composed of cascading underwater ruins and swirling ocean currents, each letter formed by bioluminescent sea creatures and floating phosphorescent particles in deep ocean indigo and electric cyan, oversized bold text emerging from infinite underwater temple depths, Swiss grid composition shattered by water refraction distortions, deep navy and phosphorescent teal palette with blinding white light ray highlights and pure coral reef accents, volumetric bubble particles and floating ancient artifact wisps, experimental typography poster art meeting submerged civilization aesthetics, hyper-detailed 3D underwater archaeological site environment, dramatic upward perspective through towering letter coral pillars and spiraling whale song arches, ethereal mysterious aquatic mood