It had to have been a dream. Some form of hallucination even if Oliver didn't recall how he got from the beach to the cave he found himself in. It had to be because Sara had been stolen from him. Screaming his name as she was sucked away by the water a second time when the Amazo went down.

But then she's there. Her hair a shower of gold, her arms laden with things and Oliver stills instantly.

It wasn't a dream.
Sara had found him.

He sinks to his knees, dizzy and exhausted as she begins to unpack things. Tools of healing. Thread. Water. Oliver is too worn to do anything more than obey. When he is directed to lay down, he lays. Move this way or that and he does. But he does manage to rasp a question.

"Where are we?"