1.   Squeeze the dough to release air bubbles and pinch the seam closed.

2.   Gently run a narrow nonnmetallic spatula or chopstick between sauce and jar sides to release air bubbles.

3.   Run a narrow spatula down between food and jar to release air bubbles.

4.   Run nonmetal spatula around sides of jars several times to release air bubbles.

5.   To clear ice obstructions, he said, an array of pipes connected to an air compressor may be installed under the ship to release bubbles.