According to a test screen viewer, there is a scene before they leave Hogwarts which seems to have replaced the argument in the forest between Dumbledore and Snape.
...when Harry goes to the top of the Astronomy Tower to meet up with Dumbledore to go to the cave. He is just walking in when Snape who had obviously been discussing something with Dumbledore gives Harry his infamous intimidating stare and walks swiftly out. It is a very brief moment and nothing more is said about it. Although I think it is safe to assume Snape and Dumbledore were discussing Dumbledore’s death. (and/or maybe discussing Harry and how he has to die).
A shot of Harry and Dumbledore apparating from the Tower was seen in the Japanese TV trailer, shown in January.
The exterior Cave scenes are to be filmed at Cape Wraith.
The exterior of the cave was shown in the second and third trailers.
Stuart Craig has stated in an interview for Movie Magic that the decision was made to use a Crystal Cave instead of a Limestone Cave.
A key to what we did this time was our initial research. We started by saying, "What's interesting about a cave?" Well, stalagmites and stalactites are probably the most familiar, almost clichéd, of limestone caves. So we started to examine crystal caves and looked to the pictures of this incredible quartz cave in Mexico. We did visit one in Switzerland and thought, "What other kind of crystal caves are there?" It turned out to be a salt crystal cave outside Frankfurt in Germany, so we went there, and it's part of a cast phosphate mining complex, but there's also rock salt down there, and in this one area salt crystals, which are completely transparent and glass-like. We took extensive photographs and used that as our inspiration. What it's done is given us this hopefully fantastic set and fantastic world but with a bit of geological credibility at the same time, which we've always tried to do. Yes, it's a magical world, but it's grounded in a recognizable reality. We've treated the cave as an extension of the architecture in that respect
A Set Report Teaser from Snitchseeker, contained a brief description of the Cave.
In terms of new sets, we saw the cave construction, which will feature in a climactic scene with Dumbledore and Harry, the inside of which I can only describe as being a cross between Isla de Muerta in Pirates of the Caribbean: The Curse of the Black Pearl and the cave in Superman Returns. With the CGI effects added, I can only imagine how expansive it will look, and how eerie it will be with its Inferi inhabitants.
Dumbledore’s cursed hand was first seen in a shot of him opening the entrance to the cave.
Shots of Michael Gambon in the interior Cave set were glimpsed in the HBP sneak peak with his hair down and Yates is directing him how to drink the potion or how to pull up the invisible chain and pull the boat out of the water.
The ABC sneak peeks and the Japanese TV trailer showed Dumbledore grabbing the chain.
A picture of Harry in the Cave emerged.
The Behind the Scenes Featurette had a shot of Harry, showing off the clam-shell scoop that’ll be used for feeding Dumbledore the potion.
A shot of the locket being taken came from the ABC sneak peeks.
The Inferi were briefly described by Dan Radcliffe.
They’re horrible,” shivers Radcliffe. “They made me think of bodies in concentration camps. It’s that terrible look of a body that’s wasted away, but not a skeleton. There are a couple of child Inferi too.”
An additional brief description was contained in the Leaky Set Report Teaser.
…and the dried-out, twisted mutation on zombies that will end up as the Inferi.
Rachezee discussed the Inferius during her interview with PrinceWatch. She has later noted after seeing them in the third trailer that they were different than what was seen in the test screening.
Scott: Is there any place in the film where they give some background or explain the Inferius?
Rachel: No --
Scott: 'Cause I know there was discussion in that scene in the book.
Rachel: Yeah. That's a good question. I don't -- I didn't -- I don't remember hearing anything about them in the movie. But -- I -- it's possible, you know, that -- that -- that was something that was something that was quickly said and I missed it, but I'm virtually certain there wasn't anything said about it.
Scott: So the audience that hasn't read the book would have no idea what those are at the end? (laughs) Rachel: No. And, actually, they -- Vince: I guess -- Rachel: They didn't -- Vince: -- they're zombies, right? They couldn't be that hard to understand. Rachel: Yeah, and also -- they're also not -- I don't -- I don't think it was really -- it's really important, I guess, in there -- in the movie as to what they really are 'cause it -- you couldn't tell that they were dead bodies. Like, it -- they -- they were just -- Vince: Awww, you couldn't? Rachel: -- they were just fig -- they were -- but they were scary as hell looking. They're just - they were just -- Vince: Oh. Scott: Hmm.... Vince: Were there like -- Rachel: -- they -- Vince: Were there like children Inferi or -- Rachel: No. They were just like the new -- you know -- Vince: Oh. Dan said -- Rachel: -- you know, the newer looking demen -- dementor -- which I personally don't like that much -- but the new -- but the newer looking dementor -- the -- you know, the scary kind of like -- it looks -- they look more solid, but they're -- but they're -- Scott: Hmm ... Rachel: -- like brown and -- there -- there's no features really to them, but they are of -- of a human body. Like they're just -- but they -- but I don't know -- Scott: Okay. Rachel: -- I don't remember -- all I remember is thinking that they looked good.
Trailer shots show Harry fighting away Inferi.
The fourth trailer, released March, showed the sequence where Harry is dragged underwater by the Inferi
The Trailers and Featurette shows shots from the Ring of Fire sequence.
PrinceWatch Transcript Episode 3 Scott: So they said about – what – 20 to 25 minutes – how long would you say the cave scene was? 5 – 10 minutes? Rachel: Oh, at least 10 minutes I think. Scott: At least 10 minutes? That’s good. Rachel: Yeah. Meesha: Yeah, that’s a good long scene. Rachel: Yeah, because there’s a – there’s multiple parts to that scene so – yeah, it could be even slightly longer… Scott: Cool.
A test screening viewer describes the cave sequence in great detail.
Dumbledore meets Harry at the top of the Astronomy tower and they apparate to outside the cave. As they are leaving Harry is surprised that that they can apparate from within the Hogwarts grounds, and Dumbledore says something along the lines of "That's the beauty of being headmaster." The scene they apparate to, despite being slightly unfinished was nonetheless absolutely breathtaking. Cliffs and huge waves dominate the scene. Dumbledore finds their way to the anti-chamber and slits his hand (for you star trek fans – he does it in a Klingon way – straight across the inside of his hand). The wall crumbles away and Dumbledore explains to Harry that Voldemort would have set up defenses around the Horcrux.
The cave is very different than what I had pictured and than all the fan art I have seen, but still a chilling and amazing sight. It reminded me a bit of a normal cave mixed with the ice crystal place Superman goes to in one of his movies. The whole cave is a vast formation of huge crystals, jagged and rough, jutting out from the ceiling walls and floor. They make their way to the water and Dumbledore cautions Harry not to touch it and he starts to raise the boat with magic. Then he has Harry reel it in with a very heavy long chain. The island is a formation of crystals as is the basin. Now the only really cheesy and unspectacular thing about this whole scene is that they use a large white clam shell partially imbedded in a small rock to scoop up the potion. In my opinion it looked rather silly. Dumbledore tell Harry to force him to drink the potion and Gambon once again does a slightly better than usual job being forced to drink the potion.
At one point towards the end you can very softly hear Dumbledore mumble something like "please don't hurt them, it's all my fault." But it was almost inaudible and I doubt anyone who has not read the book caught the line at all. Then after the last scoop is drunk, Gambon kind of goes back to his rather poor, unresearched acting and says with far too much strength. "Harry, Water."
But first Harry goes back to the Basin and recovers the locket and in the background we can hear Dumbledore saying "Harry, water" getting slightly weaker each time he says it. Harry attempts to fill the basin with water the aguamenti charm, but can not get the scoop the water up with that silly shell. After trying several times and Dumbledore starting to collapse he goes to the lake to fill it there. Suddenly the light that was emanating from the island with the basin goes out, and Harry lights his wand (most unfortunately with the non-existent spell luminous-maximus, or whatever it was he used in the beginning of the third movie), and slowly reaches down to scoop up the lake water. The moment he touches it a hand reaches out and grabs Harry's wrist. The whole audience jumped in fear. Harry tries to fend off the inferi with all the spells we hear him try in the books. But in the end he is pulled down into the water.
Before I go on I must say the inferi scene was one of the most spectacular of this movie. They looked a bit like the newer version of the dementor, but much more human shaped and brownish. I fear I am not describing them well, because they were truly a scary site to see. The camera angles captured the scene of Harry trying hopelessly to defend himself and Dumbledore from them as they clambered onto the island from all different angles and the sheer number of them eventually overwhelms Harry and he is pulled down deep into the lake.
While Harry is underwater the view we have is from below him looking up and we can see the whole island from below as well. Suddenly the inferi hold harry releases him and he swims up to a surface covered in fierce flame. The "ring of fire" Dumbledore conjures is an unbelievable sight, far more than I think anyone pictured in the books, but incredibly spectacular. Harry and Dumbledore climb back in the boat and the scene then cuts to Harry helping Dumbledore through the cave.
The ever so anticipated lines of (I am paraphrasing) "Don't worry sir, I'll get us back" and Dumbledore replying "I am not worried, I am with you" are said. Executed very well by Radcliff though rather poorly in my opinion by Gambon who clearly does not know the significant emotional value we fans know those lines have.
PrinceWatch Transcript Episode 3 Rachel: Well, they make a point about showing his wand ‘cause it’s unique looking – Vince: And it’s the Elder Wand Rachel: – and they show it in the – in the Inferi scene – they actually like show and I remember thinking, I wonder why they are showing it cause like otherwise – Vince: Because it’s a Deathly Hallow. Rachel: – I wouldn’t recognize anyone else’s wand but his so… Scott: Yeah, ‘cause I thought it was such a cool – Vince: Yeah, there is like little bubbles on it, yeah Scott: – idea that – Rachel: Yeah, that’s his.