It was difficult to closely observe the activity but helicopter reconnaissance indicated that even though no new land was formed, the summit of the erupting area was just below the ocean surface.
(helicopter reconnaissance; indicated; that even though no new land was formed, the summit of the erupting area was just below the ocean surface) Context(helicopter reconnaissance indicated,List([53, 88))):(the summit of the erupting area; was; just below the ocean surface)
helicopter reconnaissance indicated,List([53, 88))
helicopter reconnaissance the summit of the erupting area
indicated was
that even though no new land was formed, the summit of the erupting area was just below the ocean surface
just below the ocean surface