Transcript of space/ground comms immediately after Apollo 13 tank rupture.

055:55:19  LMP   Okay, Houston - -
055:55:20 CDR I believe we've had a problem here.
055:55:28 CC This is Houston. Say again, please.
055:55:35 CDR Houston, we've had a problem. We've had a MAIN B BUS UNDERVOLT.
055:55:42 CC Roger. MAIN B UNDERVOLT.
055:55:58 CC Okay, stand by, 13. We're looking at it.
055:56:10 LMP Okay. Right now, Houston, the voltage is—is looking good. And we had a pretty large bang associated with the CAUTION AND WARNING there. And as I recall, MAIN B was the one that had had an amp spike on it once before.
055:56:40 CC Roger, Fred.
055:56:54 LMP In the interim here, we're starting to go ahead and button up the tunnel again.
055:57:01 CC Roger.
055:57:04 LMP Yes. That jolt must have rocked the sensor on—see now—QUANTITY 2. It—was oscillating down around 20 to 60 percent. Now it's full-scale high again.
055:57:22 CC Roger.
055:57:30 CDR And, Houston, we had a RESTART on our computer and we had a PGNCS light and the RESTART RESET.
055:57:37 CC Roger. RESTART and a PGNCS light. RESET on a PGNCS, RESET - -
055:57:44 CDR Okay. And we're looking at our S - SERVICE MODULE RCS HELIUM 1. We have - B is barber poled and D is barber poled, HELIUM 2, D is barber pole, and SECONDARY PROPELLANTS, I have A and C barber pole. BMAG temperatures?
055:58:07 LMP Okay, AC 2 is showing zip. I'm going to try to reconfigure on that, Jack.
055:58:13 CC Roger.
055:58:25 LMP Yes. We got a MAIN BUS A UNDERVOLT now, too, showing.
055:58:29 CC MAIN A UNDERVOLT.
055:58:33 LMP It's reading about 25-1/2, MAIN B is reading zip right now.
055:59:33 CDR And, Houston, Odyssey.
055:59:38 CC Stand by 1, Jim.
056:00:35 CC 13, Houston. We'd like you to attempt to reconnect fuel cell 1 to MAIN A and fuel cell 3 to MAIN B. Verify that quad Delta is open.
056:00:53 LMP Okay, Houston. I'm showing - I tried to reset and fuel cell 1 and 3 are both showing gray flags, but they are both showing zip on the flows.
056:01:08 CC We copy.
056:03:17 LMP Okay, Houston. Are you still reading 13?
056:03:20 CC That's affirmative. We're reading .you. We're trying to come up with some good ideas for you.
056:03:29 LMP Okay. Let me give you some reading ... in the interim to help MAIN A voltage. Jack. I've got BUS TIE AC on.
056:03:37 CC Say again, Fred.
056:03:42 LMP In the interim, to help out MAIN A voltage, I've got MAIN BUS TIE BAT AC on. Or would you rather accept the 25 volts we are seeing on MAIN A?
056:03:52 CC Okay. BUS TIE AC on.
056:04:09 CC 13, Houston. We need OMNI Charlie, please.
056:04:19 LMP You got it.
056:05:32 CC 13, Houston. We'd like you to verify couple of readings for us. We would like the nitrogen pressure on fuel cell 1. We need the oxygen pressure on fuel cell 2.
056:05:46 LMP Okay. Nitrogen on 1 and oxygen on 2. Is that correct?
056:05:50 CC Negative. Oxygen on 3.

Ten minutes have now elapsed since the accident.
056:05:54 LMP Okay.
056:06:24 LMP Okay. The systems test 1-A says zip.
056:06:44 LMP And 2 Baker, which is 3 oxygen, says 0.6.
056:06:50 CC 2 Baker says 0.6, and say again the other one.
056:06:57 LMP Fuel cell 1 nitrogen reads zero.
056:07:01 CC Roger. Zero.
056:08:47 CC 13, Houston. We'd like you to open circuit fuel cell 1; leave 2 and 3 as is.
056:08:55 LMP Okay. I'll get to work on that.
056:08:57 CDR And, Jack, our O2 quantity number 2 tank is reading zero. Did you get that?
056:09:04 CC 02 QUANTITY number 2 is zero.
056:09:07 CDR That's AC, okay. Yes, that's good AC and it looks to me, looking out the hatch, that we are venting something. We are venting something out into the - into space.

(First indication that the problem is not electrical, but physical damage)
056:09:22 CC Roger. We copy your venting.
056:09:29 CDR It's a gas of some sort.
056:09:49 LMP Okay. Fuel cell 1, you just wanted it off the line now. Jack, is that right?
056:09:52 CC We just wanted you to open the circuit on fuel cell 1.
056:09:58 LMP Okay. She's off the line.
056:12:47 CC 13, Houston. We see you getting close to gimbal lock there. We'd like you to bring up all quad Cs on MAIN A, quad C-l, C-2, C-3, C-4 on MAIN A, and also bring B-3 and B-4 up on MAIN A.
056:13:14 CC 13, Houston. Do you read?
056:13:20 LMP Yes. We got it.
056:13:21 CDR Affirm.
056:13:22 CC Okay. Can you tell us anything about the venting, where it is coming from, what window you see it at.
056:13:30 LMP It's coming out of window 1, right now, Jack, and could you give me the thrusters again?
056:13:35 CC Okay, the thrusters - -
056:13:37 LMP What buses?
056:13:38 CC We'd like - on MAIN A, we'd like Charlie 1, 2, 3, and 4. Also Bravo 3 and 4 on MAIN A.
056:13:52 LMP Okay. Got it.
056:14:42 CC 13, we need OMNI Bravo.
056:14:46 LMP 0MMI Bravo.

Twenty minutes have now elapsed since the accident.
056:16:08 CC Okay, 13; this is Houston. We'd like you to to your G&C checklist, the pink pages, 1-5. To powerdown until we get a Delta of 10 amps. Over.
056:16:21 LMP All right. Roger.
056:17:03 CDR Okay, Jack, say again that - ... for the power- down; it's not in the pink pages, the 1-5.
056:17:10 CC Okay. We'd like you to go down that powerdown procedure until you get a Delta of 10 amps. Over.
056:17:21 CDR Roger. ...
056:17:50 CC 13, Houston. Did you copy our powerdown request?
056:17:57 CMP Roger, Jack. We're - yes, we're doing it right now.
056:17:59 CDR Where did you say that was located. Jack?
056:18:03 CC That's in your systems checklist, page 1-5.
056:18:26 CC And, 13, you might also check for those pages in your launch checklist. They're emergency pages; pink pages, 1-5, and we'd like you to power down until you get - -
056:18:37 CMP Okay. That was in the launch checklist, Jack.
056:18:42 CC Roger. Power down until you get an amperage of 10 amps less than what you got now. Over.
056:18:50 CDR Okay.
056:22:06 LMP Okay. Jack. Are you happy with the amps we have now?
056:22:10 CC Stand by 1, Fred.
056:22:15 CMP Okay, Jack, and on this page 1-5, we proceeded right down the list, all the way down; we're right now at BMAG number 2 is in WARM UP.
056:22:26 CC Roger. We copy BMAG 2 in WARM UP. We'll follow you through.
056:22:31 CMP Okay, and something is giving us a reach. Jack, both in pitch and roll, so I'm suspecting that maybe it's whatever it is that's venting back there. I've had to use DIRECT in order to stabilize this, and as soon as I do, we're starting to pick up rates again. Can you pick up any jets firing?
056:22:54 CC Stand by. What direction are your rates in. Jack?
056:23:06 CMP It's negative pitch and negative roll.
056:23:12 CC Roger.
056:24:42 CC 13, Houston. We need to get some more instrumentation up. We'd like you to put INVERTER 1 on both AC BUSES. Over.
056:24:53 LMP Okay. Okay, you got INVERTER 1 on both AC BUSES now. And Jack, one of the items that we turned off was the - all the fuel cell pumps. Okay, and you might let us know when fuel cell 2 needs its pump back; we ought to take care of that guy.

Half an hour has elapsed since the accident.
056:25:37 CC Roger. Okay, Fred, we want FUEL CELL 2 PUMPS to ACl, please.
056:25:55 CDR FUEL CELL 2 to ACl. Roger.
056:26:00 LMP Okay, it's on ACl.
056:27:48 CC OMNI Charlie, please, 13.
056:27:52 CDR OMNI Charlie.
056:28:06 CC Okay, 13. We've got lots and lots of people working on this; we'll give you some dope as soon as we have it, and you'll be the first one to know.
056:28:19 CMP Oh, thank you.