I'm pretty tired of waiting for an English translation to come out, so I've taken the Spanish scanlation and attempted to get an ok English translation. A bit rough, but it'll be mostly accurate. I go from right to left on bubbles on panels, traditional Japanese order. Anything that looks like it's a sound effect is not mentioned, unless it's necessary to distinguish. I don't have the skillz to patch this up into a true release, but if anyone feels like doing so, feel free, and I'll host it here. Credits to Gotei Konoha for doing a scanlation in Spanish when no one would do one in English.
EDIT1: Breaking news from the voices in my head, the alien's alphabet was actually cracked and is translatable. I'll fix those up in a bit.
EDIT2: All alien text (besides those annoying signs) have been corrected.
Bottom of top panel: A daring escape in search of a little hope. The escape route is a hideous fortress.
Vertical sidebar is just a disclaimer about the work being fiction and any relation blah blah blah
White text is just blather about how good the series is going.
Gantz 322: A Connection in the Most Frightening of Places (That's kinda rough, but who gives a damn)
Black text: You can understand why they hit so hard
Panel 4: Pedo: "Run across them!"
Panel 1: Crowd: "The current has stopped!" "Yes!" "We're safe!"
Panel 2: Crowd: "Yes! We're saved!" "Mother! Mother!" "Here we go!"
Panel 3: Naked dude: "Come to this side! We can get out on this side!" (Rough, but sufficient)
Panel 1: Escapees: "Light..." "You okay?" "You can see the light coming from above..." (The ha bubbles are all panting)
Panel 2: Escapee: "One of those things bit me on the back..." "It's hurting me..."
Panel 3: Escapee: "It bit me on the leg..." "Shit..."
Panel 4: Pedo: "Hey you..." "Are you okay?"
Panel 5: Tae: "Yes..." "I do not think... I'm hurt anywhere..."
Panel 1: Naked dude: "Yes" "I think so..." "I think there was a girl among those who escaped."
Panel 2: Naked dude: "More or less half this height" "Typical schoolgirl hairstyle... And had a pretty simple face..."
Panel 3: Naked dude: "Complained enough... And kept saying 'Kei'..." "'Kei' 'Kei'..."
Panel 4: Naked dude: "But I do not know what has become of her" (This is what I /think/ it says; Google translate says something nonsensical)
Panel 5: Naked dude: "Is something wrong?" (Kei's cryin' like a bitch)
Panel 7: Naked dude: "Are you good?" Pedo: "Only a little further now!"
Fuck those signs. Too small to transcode.
Panel 1: Escapees: "What is this place?" "We're on the surface?" "Where are we?"
Panel 2: Pedo: "Owah~!" "Look!" (I was suspicious of the haaaa, it's o wa tsu in kana)
Panel 3: Escapee: "What..." "What is this place?"
Panel 2: (Tae) (I'll be with you soon!)
Panel 3: New escapees: "Uwah~!" "What the hell are these things?" (Do not trust the ha!)
Panel 4: Escapees: "Maybe this is the city of the aliens?" "Is this for real?" (The Japanese is ma ji ka ... yo, I believe this is a better translation)
Panel 2: Escapee: "Where... Can we go that will be okay?" (This one's kinda rough. The Japanese is the conditional form in a fractured sentence with no exact translation, but it's close enough)
Panel 5: Escapee: "But..." "They're huge, damnit!"
Panel 6: Escapees: "Compared with their size..." "I wonder what will become of us?" "Insects?" "I think even their insects are huge"
Panel 1: Aliens: "Hey look" "Ha ha ha what's that?"
Panel 2: Aliens: "Funny" "That's fun"
Panel 4: Aliens: "Hey, hey!!" "Have they escaped from somewhere?" "Ha ha ha what's that?" "Aaaaaa"
Panel 2: Escapees: "They've realized that we're here!" "What are we going to do?" "We're not in danger?" "Hey!" "What are we going to do?"
Panel 1: Escapee: "We run until there are none of them nearby!" Aliens: "Look at" "Ha ha ha"
Panel 2: Escapee: "Shit! Where to? Is here alright?"
Panel 3: Pedo: "Don't leave my side!"
Panel 4: Tae: "Ok!" (The panel after this actually says Ahh~! again, what is it with GK and mistranslating Ahh~!?)
Panel 3: Escapees: "Wh..at is this?" "Tch" "Don't make any noise..."
Panel 3: Escapees: "Should we run?" "Which way?" "Do we run?"
Panel 5: Escapees: "Wh..at?" "We were in a hurry, shit!" (The last bubble said more than just shit)
Panel 6: Aliens: "This meal loses flavor" "I'm tired of this taste..."
Panel 7: Alien: "I don't need this"
Panel 1: Kei?: "Run through them!" (This could be one of the new escapees, could be Kei. Doesn't matter much.)
Panel 2: Escapees: "They... They eat humans!"
Panel 3: Escapees: "Hey, what's that?"
Panel 7: Alien: "Here, they're here"
Panel 1: Escapees: "What do I have on my back?" "Be careful! There's a group looking at us!"
Panel 2: Escapees: "What are they supposed to be?" "Police?" "We have to go!"
Panel 3: Pedo: "Disperse and keep running!"
Panel 3 black text is "unprecedented cruelty" (I believe the white text in panel 5 just says next issue is a double chapter, comes out August 5th)