How long can you stay underwater?

... Until you black out from holding your breath too long? It’s a snorkel, not a gill. You can swim facedown on the surface with the snorkel above water until you see something interesting, then you hold your breath and dive. Excellent snorkel mask!! Highly recommend!

I would go 5 feet below the surface and the mask would suck to my face and exhaling air became super hard. Notmal?

Yes the feeling of being sucked to you face normal. A. If you go deeper than the height of the snorkel tube it will automatically close to avoid a lung full of water. If it is closed when you try to inhale it will suck to your face. B. If you're not trying to breath when you're going 5ft under the pressure from the water will squeeze against your face and that can feel like it's sucking to your face. people don't realize the pressure of water is quite high even a few feet down. Time to be a nerd, for every 27.67 in of water you go down equal 1psi for 5 ft that's about 2.17psi, take the size for you mask, lets say the size is 6.5in x 8in oval that equates to about 88.5 square inches, now multiply that by 2.17 you get about 88.5, that means there is about 88.5 pounds of force pushing your mask to you face

ASIN	B085WSWNSL
Age Range (Description)	Adult
Age Range Description	Adult
Best Sellers Rank	#163,225 in Sports, Fitness & Outdoors ( See Top 100 in Sports, Fitness & Outdoors ) #242 in Diving & Snorkeling Masks
Brand	ZIPOUTE
Brand Name	ZIPOUTE
Closure Type	elastic
Colour	Blue
Customer Reviews	4.6 out of 5 stars 6,757 Reviews
Included Components	Bag, Breathing Tube, Mask, User Manual
Item Weight	816 g
Lens Material	Polycarbonate (PC)
Manufacturer	ZIPOUTE
Manufacturer Part Number	M-1502
Whats In The Box1 - Whats In The Box3	Bag, Breathing Tube, Mask, User Manual

Snorkel Mask Full Face, Foldable Full Face Snorkel Mask with Detachable Camera Mount and Earplugs, 180 Panoramic View Anti-Fog Anti-Leak Snorkeling Mask for Adults (Blue, S/M)

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