I imagine that most of you, if you've seen the second HTTYD movie, remember that part where Toothless fell into that frozen ocean and ended up almost drowning. So... What if he hadn't been rescued? Well, it might have ended up something like this, with him swimming around for minutes on end, trying to find the hole he fell in through before his lungs start filling with the icy water. Doesn't seem like he's got much longer until that happens...