Pink-footed Shearwater, the white underparts also seen well on the birds observed.

Sooty Shearwater, more than 10.000 seen.
This is a White-chinned Petrel, it is not easy to see the white on this bird, but there is something under the bill.
Sooty Shearwater, more than 10.000 seen.
Below: No white visible at his bird, but the bill indiates that it is a White-chinned Petrel.