Unique natural phenomena always attract our attention. Just the vast ocean out there has many mysteries that we have never encountered, typically the viral TikTok clip below.

In the video, a male tourist saw a strange phenomenon in the ocean waves, so he climbed up to see more clearly and used his phone to record it. It can be seen that each wave following each other accidentally created strange square shapes on the sea surface. Witnessing this scene, the video owner was still not sure if it was dangerous or not, so he posted a question to netizens.

In response to the young man, netizens said that this was a "cross sea" phenomenon, which is simply understood as intersecting ocean waves. It occurs when two ocean wave systems move towards each other at an oblique angle. Sometimes, the waves are oblique to each other at a 90-degree angle, creating strange squares.

It is a rare phenomenon in nature and looks beautiful but in fact cross sea is considered a dangerous disaster, anyone who encounters it while swimming in the sea should "take off your shoes and run" for safety.

An interesting natural phenomenon that not many people think will be very dangerous.

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According to experts, if in an area there are 2 wind currents from 2 directions, it will create intersecting sea waves. The problem is that this phenomenon can be accompanied by extremely strong tides, easily sweeping people away, so it is always considered a dangerous phenomenon.

Moreover, due to being formed from 2 different wind directions, the sea currents in this area will become very unpredictable, easily having white-capped waves up to 3m high, strong enough to cause a large ship to tilt and a small ship to sink.

If you see this phenomenon, you'd better run away!