Originally Posted by [B]TroubledByThis[/B] 
[B]My present theory is this ‘hole’ was where a projectile, perhaps a drill string portion was ejected vertically and then subsequently impacted that helipad deck.[/B]
[B]I ask anyone who is familiar with helipads on drill rigs to share info with me on WHY this hole would appear like this unless my theory of projectile is correct[/B].
[B]Same for people who know about projectiles launched vertically up risers and rigs.[/B] Help me see. I know very little specifics and I want to understand.
[QUOTE=alvis;36514]
Edit: to me it looks like it was burned through. You can see a flame/smoke pattern around the perimeter of the hole on the helipad surface. In picture D, if you look at the safety perimeter guard on the left side surrounding the helipad, you’ll see a section that’s hanging lower than the adjacent section. If you look behind this dip, I see what appears to be the sky coming through the helipad deck. This looks to be roughly where the hole should start.[/QUOTE]
I don’t see any obvious signs of impact damage to the helideck. Pic D clearly shows the platform and foam monitors for helicopter ops forward of the helideck, there is a natural break in the netting there as there would be no netting over that platform.
Sometimes the helideck is used as a temporary transit/storage area when working with boats. The hole is rectangular(ish) which suggests to me that they could have had some waste oil tanks sat there?