Jack Is Alive

When Rose throws the Heart of the ocean diamond necklace, it reaches the dorsal fin of a shark.

A merman reaches from the top side and took it. 

When he wore the diamond necklace all his memories of human life appears in the water.

He swims to the top and waves at Rose.

Rose, sees the merman and feels their magic in the ocean.

She jumps by saying Jack is alive. My Jack is alive.

The crew in Ship ran by listening to her shouting voice.

When they reached she already disappeared into the ocean.

Jack is saved by mermaids after his body freezes and dropped into the ocean when the Titanic sank into the ocean.

He prays the powers of the ocean to make a rose as a mermaid. The magic works and the rose become a young mermaid.

They both kisses and a net is approaching from the top to catch them.