i think Moya networks are aware of the under the ocean cons, this is a big project , pretty sure they will use high quality materials that can withstand possible problems that may arise deep down the ocean, shark bite being one of them.
Hi. We had to check for the answer to your question. According to the experts "Biologic Incidents" -Sharks biting the cable are very rare. Most Submarine cable cuts come from fishing trawlers dragging their gear and anchors.
The cables are heavily armored to resist underwater earth quakes, and dragging anchors. However, in the event of damage their are arrangements for repair by repair companies. These repair companies have repair ships on 24/7 stand by to repair breaks in the cable.