User blog comment:Mudsbreath/The Grimborn Debate/@comment-31135394-20170404072600

I wouldn't be surprised if they're both dead, but I'd really be surprised if Vigo's still alive. We, the viewers, didn't see him hit the lava, but it looks like Hiccup did. And then he says "It didn't have to end this way." And I trust what Hiccup saw. Some will argue that we hear Vigo land on a ledge, but that sound could be pieces of the cliff breaking off and falling just as easily as Vigo's person landing on a ledge.

I think there's more chance that Ryker is alive, given we saw Hiccup get sucked into the Submaripper's whirlpool twice and survive. Unlike the wooden ships that can get water logged and sink easily, the Shellfire ship has air sealed inside, so it could have floated back to the surface once the Submaripper stopped its whirlpool. We can assume it's also dragon proof since every metal device the Dragon Hunters make tends to be dragon proof, so the Submaripper couldn't crush it like we saw it crush a wooden ship when Hiccup was trying to free it.

Those are my opinions of the topic. 😉