Advance Slowly
They had to go about this slowly since the icy waters were very dangerous. They knew that a single piece of ice could damage the boat irreversibly. Their boat might capsize and leave them stranded out there.

Careful
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Constant Watch
It began to get more hectic now that the waves were rising and rising. The movement of the boat made it even riskier. Mallory had to tell her friends to be more careful. Two of them took over lookout duty.

Constant Watch