The ropes didn't make any sound when they fell into the pond. They fused with the water and reached the lake's bottom, where the various red crystals rested.
King Elbas' items released an almost untraceable aura when they touched the azure bottom of the pond. That energy affected the Bloodline Inheritances near the ropes and created a pulling force that attracted them.
Noah and the others could sense what was happening on the other end of their items. They could fill the ropes with their mental energy and gain a vague understanding of the events unfolding at the bottom of the pond.
The crystals moved toward the ropes and fused with their golden fabric. The four could already pull them out to seize some resources, but they left them there to attract more Bloodline Inheritances. They would continue as long as no one noticed what was happening.