I have bathymetry plots scattered all through these pages, and damned if I can find them when I need them. As a result, I keep remaking them, which is stupid. So just collect them here (most of them are repeated views of the same thing over and over).
Fine-scale charts: Kiriwina-Marshall Bennett (fathoms)to Woodlark (=> Kiriwina-Woodlark passage is about 140km wide, sill 300-400m deep, broken by 3 island groups)
(=> Woodlark-BudiBudi passage is less than 8km wide, probably shallow)