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Description
“Then we had our first sight of a ‘sea-tank’. A curve of dull, grey metal sliding into the Square...
The previously smooth fore-and-aft sweep of its top was now disfigured at the highest point by a small, dome-like excrescence. It was lighter-coloured than the metal beneath; a kind of off-white, semi opaque substance which glittered under the floods. It grew as one watched it...
It had been burst into instantaneous bloom by a vast number of white cilia which rayed out in all directions... like long, white whiplashes,”

Sea tanks start to harvest people from coastal islands. This is one of the only times we get a glimpse of the alien's form and technology.

Description
“Then we had our first sight of a ‘sea-tank’. A curve of dull, grey metal sliding into the Square...
The previously smooth fore-and-aft sweep of its top was now disfigured at the highest point by a small, dome-like excrescence. It was lighter-coloured than the metal beneath; a kind of off-white, semi opaque substance which glittered under the floods. It grew as one watched it...
It had been burst into instantaneous bloom by a vast number of white cilia which rayed out in all directions... like long, white whiplashes,”

Sea tanks start to harvest people from coastal islands. This is one of the only times we get a glimpse of the alien's form and technology.