As the tumult subsided, the currents steadied above them, heralding the dawn against obstacles in the rippling waves of spent energy. The merging of voices cascaded toward the surface; the raging tumult that threatened to consume them now softened, embracing them in profound dignity and reverence.

From the depths of the ocean, Victor felt the presence of the leviathans—a shared song piecing their existence together as it dwindled into recognition, vibrating against each gentle touch of wave, against every echoed heartbeat resonating within. He could feel it profoundly—the currents of the universe converging and sealing the bonds formed through connection.

Moments passed as the surface shimmered above, glistening like starlit reflections of what signified beginnings anew. Approaching the surface, the leviathans beat their massive tails alongside the submersible, steadying it against the lifting currents, departing from turbulence.

"We can still talk to them," Victor urged, sensing a lingering tension in the air. "There's still so much—"

But Tamar looked at him, a blend of relief and exhaustion painted across her features. "We've survived. It's enough for now. We have to return. Others must know of this!"

And with that, they broke through the final veil, emerging into the sunlit world above—a brilliant tapestry of stars many leagues around them tended entwined in cosmic dance. The leviathans circled, their colossal forms gliding gracefully in the waves, acknowledging a new beginning—with them.

Victor gazed down into the astonishing depths from above, unable to wrestle the emotions swelling within him. They would forever remain connected by threads of understanding forged beneath the waves of Eridanus IV.

As the shimmering waters awaited their return beneath the constellations, he allowed himself to embrace the uncertainty of what lay ahead. Perhaps there were stories still unwritten amongst the depths—a mesmerizing dance of beings drawn to fruition, a kinship that rippled through the fabric of existence.

As Pacifica Station's vessel rose higher above the ocean, a song sang in echoes through the deep, reverberating against the cosmic tapestry. The songs of the unseen filled the air with harmony; empathetic connections bloomed through a reconciled surge—a world interlaced with understanding and existence, ripe for discovery.

Victor took a deep breath; in that lingering essence, the currents pulsed with hidden meaning, resonating through the heart of civilizations—the crescendo of the cosmos was far from over. The journey continued onward; how they would navigate the uncharted constellations ahead remained tethered in the lights of radical unity.

As he boarded the submersible with Tamar, they turned, holding firm the lessons gleaned in that cosmic embrace—the resonance of belonging against odds that once overwhelmed them. And beneath its waves, Eridanus IV thrummed—the awakening of an expansive world longing for connection, going forth upon the Celestial Echoes of existence.