Fluid, Liquid
A tsunami that hits at night leaves even more fluid than normal. It's dark at night, so the sun isn't there to help evaporate all that tsunami liquid.
Picture the dark fluids from the tsunami flowing by your window at night. You look out and the liquid is shining in the moonlight. It looks like an entire sea is out there!
えき
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This fluid stays in the 駅 (えき) longer than anywhere else. All of those tsunami liquids pour deep inside the 駅 late at night and the sun still can't reach them to help evaporate them during the day. It's a real *night*mare.
Picture the 駅 filled to the brim with fluids and liquids. Maybe if you swim, you'll be able to catch your train.