Xiaomi Yi Cam - Water proof case & Bluetooth remote (I've got both)

hi, i got this Kingma waterproof case and noticed a crack looking thing close to the power button.
I tested it in a sink and it's not leaking, but not sure what will happen 2 or 20 meters under water.
Guy who sold it says it's "injection of gas" and it's normal. But I'm not so sure about it. Especially knowing how fragile this thing is around the power button.
What do you think?
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