Expeditions to this underwater city have been met with adversity, trying to combat the pressure of the trench’s depths and indeed its protective citizens. In 990 PO, an advanced submarine from Ingenium captured images of jellyfish-like structures at the bottom of the Vena Trench. The submarine was attacked on its return journey by triton riding giant sharks. Fortunately, the crew was able to escape unharmed. The crew, who until that moment had only inferred its existence, named the mysterious underwater city Abyssus.