when i log off there was no land in sight, when i logged in i found that i was inside the North island mountain...so there was land after all, just for some reason became invisable
Not often but I have seen glitches like this. Most often I find it's because I've accidentally moved into terrain and it isn't visible from the underneath. Normally I can move back through it though.
I'm guessing it's a bug in the save game and it incorrectly recorded the cyclops location. I've had a near miss similar to what you describe. I parked my cyclops 20m off shore, but when I loaded the game the cyclops had its nose on the beach. Fortunately, the game compensated by destructing a section of the beach and I was able to back out to sea.
I've also had corrupted save games over things you would never think would even be in a save game. For instance one game went bad because the fabricator processing time changed from 4 secs to 12, to 24, to 48, and I gave up when it was taking 2 minutes to build anything. I've also had my life pod getting reloaded further and further out to sea which left me stranded since I had no vehicle or powered base I could fall back on.
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I've also had corrupted save games over things you would never think would even be in a save game. For instance one game went bad because the fabricator processing time changed from 4 secs to 12, to 24, to 48, and I gave up when it was taking 2 minutes to build anything. I've also had my life pod getting reloaded further and further out to sea which left me stranded since I had no vehicle or powered base I could fall back on.