Going on a cruise can sound like one of the most exciting ways to spend a long holiday, especially if you've never been on one.
However, there is an unseen side to cruises that only people onboard will know about.
There may be some rules for passengers to follow on cruises, or words you can't say, but at the end of the day, cruises just look cool, don't they?
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People can end up loving cruises so much that they buy flats on the ships themselves, but the hype around them may not be as huge as warranted.
One TikToker has revealed one thing about cruises that can make you forget how great it is.
User @chasingthedream.hj has shared one thing about cruising that might put some people off taking to the high seas.
The video begins by saying 'Cruises are great until you realise'.
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He begins to explain: "Cruises are great until you realise how dark the ocean gets at night."
Saying that he has done a video before on this that raked in almost three million views, he mentions that comments ask 'what do you expect, it gets dark at night'.
The TikToker continues: "Unless you've been on a cruise ship, you're not going to understand how dark it gets at night.
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"And then they say, 'all you're doing is showing the swimming pool', it's kind of because there's nothing to see if you look overboard at night because it's absolutely pitch black."
Describing it as 'the blackest black you'll ever see', he shows viewers what he can see overboard.
And lo and behold, it is absolutely pitch black like - worse than trying to get to the loo at night - pitch black.
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He then asks if that's what they want, a minute of him filming the pitch black of the ocean, instead of the parties and events held on the pool deck.
People were pretty spooked by this revelation in the comments.
One user said: "Imagine falling overboard at night, you survive the fall. Nobody saw it. You see the ship leaving. You’re alone and see nothing." Creepy.
Another commented: "You can not pay me enough to go on a cruise".
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A third put: "Now imagine being on the Titanic with no moonlight…"
Many seemed to be put off cruises by the discovery, but I reckon if you do go on a cruise and don't fall into the black abyss at night, you'll have a whale of a time (pun intended).