All but a fine layer of ice was removed from the ship by delicate ablation, with the final layer melted away over a period of six days. A flock of sensors hovered around the ship like gulls, sniffing the argon for any traces of foreign matter. But apart from chips of hull material nothing unusual was detected.

Skade bided her time, taking every possible precaution. She did not touch the ship until it was absolutely necessary. A hoop-shaped imaging gravitometer whirred along the ship, probing its internal structure, hinting at fuzzy interior details. Much of what Skade saw matched what she expected to see from the blueprints, but there were strange things that should not have been there: elongated black masses which corkscrewed and bifurcated through the ship’s interior. They reminded her of bullet trails in forensic images, or the patterns sub-atomic particles made when they passed through cloud chambers. Where the black masses reached the outer hull, Skade always found one of the half-buried cubic structures.

But there was still room in the ship for humans to have survived, even though all the indications were that none still lived. Neutrino radar and gamma-ray scans elucidated more of the structure, but still Skade could not see the crucial details. Reluctantly, she moved to the next phase of her investigation: physical contact. She attached dozens of mechanical jackhammers around the hull, along with hundreds of paste-on microphones. The hammers started up, thudding against the hull. She heard the din in her spacesuit, transmitted through the argon. It sounded like an army of metalsmiths working overtime in a distant foundry. The microphones listened for the metallic echoes as the acoustic waves propagated through the ship. One of Skade’s older neural routines unravelled the information buried in the arrival times of the echoes, assembling a tomographic density profile of the ship.

Skade saw it all in ghostly grey-greens.