The Fate of the Sword Halcyon addon - Alien Assault

The Blood Angels' vessel SWORD OF HALCYON was journeying through the warp back to Earth, when it suddenly jolted. The alarms rang and the navigator prepared for the worst.
They had encountered a warp storm and the ship was spinning out of control.The scanners went wild, indicating flashes of huge metallic structures as big as cities. Massive rifts in the warp tide hurtled the ship through pockets in the flux. As the storm came to its climax, a giant space hulk appeared. Purple lightning hit the SWORD OF HALCYON and all aboard braced themselves as it crashed into the massive hulk. Churning through layers of twisted metal, the whole side of the ship caved in. Then, everything fell silent.
From the front section of the ship, which had plunged through the hull of the space hulk, functionning scanners showed a steady build up of new alien life signs. The moans of the injured and dying, audible thoughout the ship, suddenly changed pitch. They now became a cacophony of terror and pain, mingled with the chatter of bolter fire and the bestial shrieks of an enemy all dreaded, but none dared to name. Genestealers!
The surviving Blood Angels space marines in the rear section of the vessel had no option but to retreat to the escape capsules. The SWORD OF THE HALCYON drifted in space, flames periodically guttering across its surface bearing testimony to the destruction within.A few hours after jettison, the Imperial battlebarge MAYAN picked up the battered escape pods....