During this time the captain had thrown off his vest and shirt, and secured his trousers round his waist; his feet were naked, so he had no shoes and stockings to take off; after these preparations he placed his finger on his lips, and lowering himself noiselessly into the sea, swam towards the shore with such precaution that it was impossible to hear the slightest sound; he could only be traced by the phosphorescent line in his wake.
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She loves to swim in the ocean on nights when phosphorescence shines in her wake.
The phosphorescence is caused when movement in the water causes plankton to release tiny pulses of light.