Found another forgoten chapter. Here it is.

(Hiccup's POV)

Toothless and I reached the cave. He swam  to it. It was dry and warm inside the cave. I rolled off Toothless to catch my breath. He did a annoyed huff and nudged me with his snout. 

"Sorry bud. But I'm not the All powerful everlasting Nightfury unlike you!" I said scratching​his head. 

He rolled his eyes playfully. We walked down the cavern. We heard a dragon friend and ran to it.

A little dragon lied on its side crying. I slowly approached​ it.

"Hey there little guy. It ok. My girlfriend saw you and sent me down. Are you ok?" I asked it.

It looked at me.

"What kind of dragon are you?" I asked.

It was definitely a baby. But what kind, I have no idea. It had redish pink eyes, green horns like a natter, the face of a Monstrous Nightmare, the tail of a razorwhip,  and the body of a changewing.

Toothless suddenly became uneasy.

"Hey bud, why don't you head back up?" I asked.

He put in his worried face and grumbled lowly no.

"Please?" I asked.

He huffed sadly and nudged me with his nose. He quickly went back up.

I knelt next to the dragon. 

"What's wrong little guy?" 

He suddenly sat up and screamed so loud I had to cover my ears. A bigger version of him came out.

"Your not hurt!" I said in disbelief. I dodged a blast of fire from the bigger dragon.

"You looked like a mash pot... So that's what we'll call you guys. Mash pots... Even though it sounds real stupid." I muttered. 

Another blast.

"Yeah, you aren't good news." I said running towards the entrance. 

It shot agian as I hit the water.

(Astrid's POV)

Hiccup hadn't come back up yet. When Toothless​ shot up out of the water I became worried.

But it didn't seem like anyone was wrong... But a few minutes later, he called for Hiccup looking at the water. I rushed next to the panicking Nightfury. I saw a blast of fire. 

"Hiccup?!?" I asked out loud.

Toothless dove into the water and came back up dragging Hiccup who was passed out. I ran up to him.

"Hiccup​?!? No! Wake up please!" I cried.

He didn't​ stir. Toothless called him agian. Nothing. He licked his face and he sat up coughing. I hugged him

"What happened?" Snoutlout and Fishlegs asked.

He told us.

"Never ever agian." I said

"Your right." He siad.

"What are you two talking about?!?" Snoutlout asked.

We rolled our eyes.

"Everyone, get ready, we're going home." He siad.