As the symphony of life formed around Victor, Tamar, and the aquatic beings, a steady kinship arose among the leviathans, shaking the very foundation of what once stood distinctly defined by enmity. The feeling, palpable and reminiscent of cosmic oneness, threaded vibrantly against the darkness of the ocean.

Yet as their accord blossomed, the majestic leviathans surrounded the submersible, spiraling gracefully, exchanging glimpses full of reverational sparks. Within those dialogues lay an understanding—the latent power to transcend barriers forged through mistrust and fight, birthing knowledge through nurturing each existence immersed within the universe.

"It's breathtaking, isn't it?" Tamar's voice trembled—a hauntingly beautiful mixture of awe and bewilderment as the leviathans weaved around them, bridging gaps through tender recognition. "To witness life communicate across beings!"

"I knew... I knew there was something extraordinary here," Victor breathed, bliss washing over him like waves thrumming at their feet. Drawing closer to deep waters, a vision ignited within him. "We are meant to be more than mere explorers. We hold the power to choose understanding—coexistence knowledge that could mold our futures!"

As patterns danced between the leviathans and the aquatic guardians, serenity rippled through the vibrant connections they maintained. Each pulse conveyed love—marked by acceptance and fate. There they hovered, a web of light illuminated by the consciousness and voices that cascaded forth, for every twinkle in the dark resonated with profundity and mystery.

But while the crescendo continued, seeking the zenith of understanding, tumult grew beneath the depths. Unbeknownst to them, the planetary cycle of Eridanus IV surged toward a cataclysmic event, a tremor rippling through the oceanic floor—a phenomenon of cosmic scale that threatened to unravel this budding kinship.

"Victor," Selene's voice intruded, thrusting the urgency forth, "Detected anomaly—a seismic shift is about to occur. Immediate evacuation needed."

But the bittersweet irony tinged Victor's heart; after wrestling against isolation, here lay the key to survival—a juxtaposition playing amid chaos and beauty. And yet, they were caught in tumult amid something divine—a descendant force coaxing relationships into existence.

With every impulse thrumming, he glanced around; Tamar's apprehension rippled through their shared awareness, sensing impending catastrophe close at hand. "If we wait—"

"No!" Victor interrupted, feeling compelled to advocate a possibility for harmony; understanding needed to transcend all dangers. He stepped forward toward the leviathans, attuned deeply their eyes aligning mirrored light. "I can send our message of peace—they must know the enormity of our connection! They must understand!"

The leviathans' surface rumbled with a response—the mingling of energies of urgency and determination merged through Victor. As worry encased Tamar, she watched Victor, torn between science and the threading ties of empathy.

Yet in a span of impossibly fleeting moments, he drew deeply from the well of connection and shared thought. "This is the price we pay—we go together!" And as the waves began to surge around them, he broadcast his harmonizing intentions, compelling frequencies rising all around—hope glimmering amidst the tide.

The rhythm crescendoed, charged with desperation and strength, as pressures surged near.