Here is our Space Eagle Total Destruction video walkthrough for Angry Birds Space Pig Dipper level 6-21. Send the Sardine can towards the submarine, trigger upon impact. Then send Terence north, towards the rope. The tnt will drop and clear any floating pig, while Terence sinks down to destroy the rightmost pig.
If you have an alternate strategy please feel free to leave a detailed comment below.
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1. Land the 1st Sardine Can on the Sardine Can on the stone triangle on the top of the submarine. Everything was destroyed except the pig on the far right next to the red sparking shell
2. Land the 2nd Sardine Can near the far right pig.