This is embarrassing to ask, considering I read Aquaman currently. In Justice League they mention Aquaman "coming back from dying", and I'm trying to understand what they are talking about since he's alive and well in his own book and has been for a while.

Also, did they ever explain how he ended up on that island with those folks in the Unspoken Water arc? They showed Mera revealing she's pregnant to Arthur, him not reacting well, then she flipped out. What exactly happened to Arthur?