Must be noted that Cuvier's beaked whales are big animals (I had touched several of then and they are impressive) but even at their 5m long they are like small cats against the much bigger Berardius. Those can dive probably much deeper than the standard beaked whale.

https://uk.wikipedia.org/wiki/%D0%9F%D0%BB%D0%B0%D0%B2%D1%83...

The article talks about a track of holes of about 1x3m diameter. It could fit with the beak of a Berardius (or a Sperm whale?) picking things from the bottom.