CT Now she is my only link to finding the rebel base

Did Vader and Tarkin not think to interrogate the other prisoners they took from the Tantive IV to find out the location of the rebel base in ANH? I'm assuming that the base was so secret that even those who were there did not know the name of the planet they were on and it had a code-name or something. Even then, a rebel prisoner being tortured would probably disclose that the base was in a temple in a jungle. Or were the crew of the Tantive IV never at Yavin and came to Scarif fresh from Alderaan?

 

The Tantive IV is docked in the hangar bay of Raddus's ship in the movie (the novelisation reveals that this was due to engine problems). The crew may not have ever even seen the planet below, much less heard its name.

 

That's a possibility, though 3P0 and R2 travelled from Yavin to the Tantive IV, which implies others did so, particularly Captain Antilles as he was their owner at the time. Maybe if Vader hadn't have strangled him, the outcome of the movie may have been very different

 

The crew of the Tantive IV was murdered on Vader's orders shortly after the ship was captured.

 

Vader interrogated Captain Antilles and he didn't talk, may be the Rebel soldiers didn't talk either?

 

"though 3P0 and R2 travelled from Yavin to the Tantive IV" -
Wait a minute - is that the case? I've never scene this info, even in the source books.

 

Threepio (and I think R2 as well) appear on Yavin in Rogue One very shortly before the attack on Scarif. Threepio says "They're going to Scarif? Why does nobody ever tell me anything?"

It follows that if they were on Yavin in that moment and yet on the Tantive IV when it undocks from Raddus's ship above Scarif at the end of the battle, they must have been flown up from Yavin to Raddus's ship and the Tantive IV, very quickly, right before Raddus went into hyperspace.

 

Is this established elsewhere?

In the film we can see a number of rebels held under arrest while Vader is choking Antilles.

 

It was in the original novelization back in '77.

 

While the spies who sent the plans are called out as dead:

The huge metal skull dipped close. “I know that several transmissions were beamed to this vessel by spies within that system. When we traced those transmissions back to the individuals with whom they originated, they had the poor grace to kill themselves before they could be questioned. I want to know what happened to the data they sent you.”
Neither Vader’s words nor his inimical presence appeared to have any effect on the girl. “I don’t know what you’re blathering about,” she snapped, looking away from him. “I’m a member of the Senate on a diplomatic mission to—”
“To your part of the rebel alliance,” Vader declared, cutting her off accusingly. “You’re also a traitor.” His gaze went to a nearby officer. “Take her away.”

It's a little vague about surviving crew. He orders that the Senate be told that the ship was destroyed by meteorites and the crew killed that way - but there's room for the possibility that some crew were simply imprisoned by him.

“If word of this does get out, there will be much unrest in the Senate. It will generate sympathy for the rebels.” The Commander looked up at the unreadable metal face, then added in an off-handed manner, “She should be destroyed immediately.”
“No. My first duty is to locate that hidden fortress of theirs,” Vader replied easily. “All the rebel spies have been eliminated—by our hand or by their own. Therefore she is now my only key to discovering its location. I intend to make full use of her. If necessary, I will use her up—but I will learn the location of the rebel base.”
The Commander pursed his lips, shook his head slightly, perhaps a bit sympathetically, as he considered the woman. “She’ll die before she gives you any information.”
Vader’s reply was chilling in its indifference. “Leave that to me.” He considered a moment, then went on. “Send out a wide-band distress signal. Indicate that the Senator’s ship encountered an unexpected meteorite cluster it could not avoid. Readings indicate that the shift shields were overridden and the ship was hulled to the point of vacating ninety-five percent of its atmosphere. Inform her father and the Senate that all aboard were killed.”

But he also orders the ship itself vaporised,

“The data tapes in question are not aboard the ship. There is no valuable information in the ship’s storage banks and no evidence of bank erasure,” the officer in charge recited mechanically. “Nor were any transmissions directed outward from the ship from the time we made contact. A malfunctioning lifeboat pod was ejected during the fighting, but it was confirmed at the time that no life forms were on board.”
Vader appeared thoughtful. “It could have been a malfunctioning pod,” he mused, “that might also have contained the tapes. Tapes are not life forms. In all probability any native finding them would be ignorant of their importance and would likely clear them for his own use. Still...
“Send down a detachment to retrieve them, or to make certain they are not in the pod,” he finally ordered the Commander and attentive officer. “Be as subtle as possible; there is no need to attract attention, even on this miserable outpost world.”
As the officer and troops departed, Vader turned his gaze back to the Commander. “Vaporize this fighter—we don’t want to leave anything. As for the pod, I cannot take the chance it was a simple malfunction. The data it might contain could prove too damaging. See to this personally, Commander. If those data tapes exist, they must be retrieved or destroyed at all costs.” Then he added with satisfaction, “With that accomplished and the Senator in our hands, we will see the end of this absurd rebellion.”


yet in the ST it's one of the ships in the Battle of Exegol. It was later clarified that the ship was never destroyed and that Leia eventually got hold of it again.

 

That could be a plot hole with RO going into ANH, somehow they are transported from the surface of Yavin to where ever the Tantive IV was. And that is another thing, where is Leia when Threepio says "they're going to Scarif". But I believe we're not supposed to to take this so literally, there whole point of the scene was just to have two very popular characters link to their appearance in ANH without having them in the way during the final moments when Antilles brings the data tapes to Leia.

 

hopefully the droids' GPS was deactivated.