I ended up making an unexpected incursion inside the Orpheon. Knowing I wasn't ready yet, I proceeded with maximum caution! Vid timeline:
(0:00) Intro and Gravity Chamber room highlighted.
(1:51) Tallon Overworld and Great Tree Hall.
I hit what appeared to be a room with multiple dead ends. Unfortunately, I failed to noticed with route that involved the use of the Morph Ball.
(11:50) To Transport to Tallon Overworld East.
(17:42) Crash Site.
To my surprise, I ended up discovering a way around the Grapple Hook points, over the lake, toward the crashed Orpheon.
(19:56) Entering the Orpheon.
I knew I wasn't ready to venture all the way in yet. I'm still missing multiple pieces of equipment. Still, given I found a way to the front door...
(26:15) Orpheon's flooded areas.
Many of the Orpheon's rooms ended up flooded by the lake, making movement difficult.
(49:22) Cargo Freight Lift to Deck Gamma.
It turned out that what prevented me from continuing was not a Door that I could not open. But, the underwater environment. Apparently, there's a piece of equipment that enhanced mobility in such environment. And it appears what's where I'm going next.
Fortunately, this Orpheon visit did not completely went in vain. Before I could not go any further, I did found another Energy Tank.
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