What was james plan to escape the sharks?

In Chapter 20, James announces that he might have an idea of how to escape the sharks, but he is not sure if it will work - he needs string. Assuming that there is no strong onboard, he believes his plan destined to fail, but the creatures reveal that Silkworm is actually below; James just hasn't seen her yet. Both Silkworm and Miss Spider are capable of spinning as much string as James needs. He tells them more about the plan, and reveals that he is going to lure seagulls towards the peach with Earthworm, then loop strings around the seagulls' necks and tie the strings to the stem of the peach. If he can do this with hundreds of seagulls, James believes that the birds will lift the peach up into the air with the power of their wings.