'Damn it, that's a silly question,' I said, then immediately had second thoughts as I saw what he was getting at.

'We're probably within five miles of Minerva right now. You said that the conditions that created our prize nodules were local, in your estimation. What exactly did you mean by "local"?'

'I won't know until I find it. It could be an area often square miles – or it could be fifty thousand.'

'I think you should drop your dredge around here and see what you can find. We could be right on top of your "locality".'

I felt very foolish. In the mixture of anticipation and boredom that had gone into our two-day search so far I had actually forgotten what we were really here for- and I'd made plans for action earlier in the trip. 'You're right, Geordie. We've wasted some time and it's my fault. Of course we can dredge and keep a lookout for Minerva at the same time.'

Campbell and Clare cheered up visibly. The prospect of doing something other than cruise gently back and forwards was enticing, and I wondered how long it would be before their fresh interest waned once again. I didn't have any hopes of a great find.

So I started to get the winch ready for operations. The seas were choppy and flecked with white and Esmerelda was lurching a bit as the dredge went over the side. As we'd done the drills before things went fairly smoothly, though I'd had to take the Campbells aside with a strong suggestion that they should not appear too eager – to the others this was to be a standard research procedure. The recording echometer was registering a little under 15,000 feet.

We dredged two sites that day and five the next. On two occasions operations were interrupted when something was sighted that looked very much like a coral reef, lying some twenty feet under the water, but on both occasions this turned out to be masses of a greenish algae floating on the surface, and we had our share of false alarms when fish shoals were seen. I was kept very busy in the lab analysing the stuff we had brought up, which often included volcanic particles amongst the other material – this pleased me as it bore out some of the theories I was turning over in my mind. We recovered many nodules but test results were poor and disappointing to the others, if not to me. I hadn't expected anything.

I showed a sheaf of papers to Campbell at breakfast, away from the crew. 'Just the stuff you might expect from round here. High manganese, low cobalt. In fact the cobalt is lower than usual – only. 2 per cent.'

Geordie said, 'We've only been dredging west of where we think Minerva is- how about a stab at the eastern side?'

I agreed and he said, 'Right, we'll go there today.'

There wasn't much point in pulling the winch down and making sail for such a short trip so we motored across the few miles, starting immediately after breakfast. The sea was calm again with just the trade wind swells and no whitecaps, which would make the search easier.

It was Ian Lewis's watch and he had given me a spell at the wheel. I wasn't much of a practical seaman and I wanted to learn while I could, during periods of calm weather, under the watchful eyes of Ian or Geordie.

Clare was sitting talking to me. 'Isn't this the life,' she said. 'I had flying fish for breakfast this morning. Taffy saved them for me – I think he's falling for me.'

'Your dad isn't enjoying it,' I observed.

'Poor Pop, he's so disappointed. He's like this on every new project though, Mike. As long as it's going well he's on top of the world, and when it isn't he's down in the dumps. I keep telling him he'll get ulcers.'

'Like gout, it's supposed to be the rich man's ailment. That should cheer him up,' I said. 'It's only'

Danny Williams's voice soared up from the bows, cracking with excitement.

'Go left! Go left! Go to port!'

Someone else started shouting.

I spun the wheel desperately and Esmerelda heeled violently as she came round. Hanging on, I had only time to see a jumble of white waters in the sunshine, and then to my intense relief Ian was with me, taking over at the wheel. I fell away from him, cannoning into Clare who was also off balance. Shouts and the thud of bare feet told me that the whole crew was tumbling up on deck to see what was happening. I noticed the echo sounder and in one incredible second I saw the indicator light spin round the dial. It looked as though the bottom was coming up to hit us.

Ian let Esmerelda continue to go about until the foaming area in the sea was well behind us, then straightened her out and the indicator light of the echo sounder spun the other way just as fast. He throttled the engine down and I took a deep breath to steady myself. Geordie came running along the deck.

'What the hell was that?' he shouted.

'I think we damn near speared ourselves on a reef – I think we've found her,' I gasped, still winded. Everyone was crowding to look astern at the jumble of white waters, but from where we were it was already impossible to see anything underneath it. 'Unless it's more fish'

Ian said, 'No, it was a reef. I saw it – about a foot sticking out. And we shoaled bloody fast just then too.'

Campbell came up from below, looking startled and groggy. He may have been asleep. 'What's happened?'

'I think we've found Minerva.'

He looked aft and saw what we were all trying to get a better glimpse of. 'What, that?' he asked incredulously.

'Is that all?' Clare asked. Some of the crew, the non-sailors, looked equally baffled.

'What did you all expect – the Statue of Liberty?' I asked.

'We've got it, boys, wherever it is we're there!' Geordie was exultant and relieved, and more nervous for the safety of his ship than ever.

Danny Williams came aft to a little storm of back-patting. 'Good job you kept your eyes open,' I told him, and he looked very pleased.

'God, I was never so scared in my life,' he said. 'It came out of nowhere – now you see it, now you don't. I thought the bloody boat was going to ride up on it. You were pretty handy with that wheel.'

There was another murmur of assent and it was my turn to look pleased.

Geordie said to Ian, 'I want you to keep her just where she is. I'll bet that if we lay off a couple of miles we'll never find it again. Christ, it's lucky it's almost low water, it wouldn't show at all otherwise. It'll only dry out to about three feet at this rate.'

'There'll be coral clusters all round,' I said, reinforcing Geordie's warning. 'And deep water between them and the actual reef. There'll be a lagoon beyond that. An atoll is forming.'

I saw that they were all taking an interest, apart from Ian and the on-watch lookouts, so I expanded a little. 'This rock spear that was underneath us can't have been there very long, or it would have been higher – you'd have an island here. But this coral has only just started to form.'

Geordie said suspiciously, 'What do you mean by "only just"?'

'Within the last five or ten thousand years – I'll know better when I can take a closer look at it.'

'I thought you'd say that. But you're not going to look at it. Do you think we could get to the middle of that little lot?'

We all looked back towards Minerva, if Minerva it was. 'No,' I said dubiously. 'No, perhaps not.'

Campbell had a question on his lips that he was dying to ask, but not in public. Headshakes and heavy gestures indicated his desire for a private word, so I extricated myself from the still excited crew and followed him below together with Clare.

Campbell said, 'I'm sorry to interrupt the course of pure science, but how does this tie in with the nodules? Do you think we're going to be luckier now?'

I said soberly, That's just the trouble; I don't see how we can. Most nodules are very old, but Mark's was comparatively young. He had a theory which I'm beginning to grasp, to do with them forming very fast as a result of volcanic action. Now there's been volcanic action here all right but much too long ago for my taste. There's been time for a long slow coral growth and it doesn't quite tie in.'