 In this plan view of the area shown in the
photograph above, the reef (in brown) has been cut away top
left to show the position of the archway. The contour marks
show how sharply the depth increases from the entry point and
continues to drop away beneath the arch
| Blue
Hole - elevation view
|
 Seen in profile, the rapid depth increase
and the unexpected thickness of the arch becomes apparent. The
inset view of the approach to the arch reveals a jagged
silhouette. The highest passable part of the roof is at 55m,
with a notch up to
52m
| |
|