Which

I wonder if "which" means,

1. dive

2. anything else.

In 1974 52 year old Candelaria Villanueva was shipwrecked in the waters off the coast of Manila, Philippines.

She began to pray when a giant turtle swam toward her. Wildly she clutched its shell. For two days the turtle swam and towed her toward land, refusing to dive, which sea turtles need to do to hunt for food. The turtle stopped eating to save this woman's life.