The ocean floor gradually slipped out of sight, and the submersible began to thread its way between vast columns that Dakota guessed must be the towers she’d seen earlier from the shore. Eventually the submersible headed straight towards one, before passing through an oval opening in its side, which led into a shaft at least a hundred metres across. The submersible began to rise through that shaft, ascending before long into an air-filled cavity.

The hatch opened with a hiss. Dakota pushed her head out and saw that the submersible was now floating in a wide moat between the tower’s outer wall and an enormous circular platform surrounding a column rising at the tower’s centre. Windows made from some crystalline material provided a view of the ocean waves from a few metres beneath the surface.

The platform itself was quite wide enough to support a Shoal superluminal yacht, floating on a bed of shaped fields. Waiting next to it, as Dakota had known he would be, was Trader in Faecal Matter of Animals, safely contained within a field-suspended sphere of water.

Dakota pulled herself out of the hatch and jumped down on to the platform, which looked and felt like black glass as she reached down to touch it. Trader drifted closer, and she watched how his manipulators clutched and wriggled beneath the wide curve of his body.

When he spoke, the familiar tones of his synthesized voice seemed to fill that dank underwater space.

‘Once again, mellifluous greetings,’ he said. ‘Did you enjoy your trip to the Maker? And don’t say I didn’t warn you.’

‘F . . .’ She cleared her throat with some difficulty, and dug her fingernails into her palms, then tried again. ‘Fuck you, too, Trader,’ she finally managed to say, and touched her throat with nervous fingers.

‘I congratulate you on having survived your encounter, Dakota. Few ever do.’

She stared back at the alien and felt a familiar seething anger well up inside her. It was easier to give in to the feelings of the old Dakota – the real Dakota, as some treacherous part of her mind insisted on thinking of her.

‘Yes, Trader. I survived, and I got your message. Now tell me how you know so much about what I found out there.’

‘The Consortium is an open book to those with the means to decrypt its most secure transmissions.’

‘Not good enough. I was only ever in contact with other machine-head navigators.’

‘The Shoal could not have brought about the deaths of the original Magi navigators without having the means to intercept their communications traffic, a skill that remains with us. You can be assured, however, that the coordinates you recovered from the Maker stay a secret with me. Even the Shoal Hegemony remains unaware of the expedition.’

‘What expedition?’

‘The expedition your friend Lucas Corso recently sent out towards the coordinates associated with the Mos Hadroch, of course, Dakota.’