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If it was just one coffin, it wouldn't have stirred Zachary's emotions, but as time passed, more and more coffins surfaced, and as they did so, all the coffin lids were facing upwards. Once the coffins fully emerged, they began to sway gradually.
Although it was normal for the coffins to sway a bit immediately after floating up from underwater, as even a solid piece of wood floating on water would bob and weave with the waves, let alone such large coffins.
However, through Zachary's Divine Sense observation, he was sure that the reason for the swaying wasn't due to the push of the waves, but rather something inside the coffins causing mischief.