Spoiler
Turns out the map to the Progenitor's technology is also the key to open the case, once opened, the Breen (and Moll) discover a transdimensional portal inside the case, the final security measure. A couple Breen soldiers attempt to enter but are sucked into the portal and vanish. Of course, Discovery's attempts to steal it doesn't go well with Book and Burnham getting caught the moment they put the transporter lock on it. Discovery rams their way into the shuttle bay to rescue the away team, but Moll enters the portal and Burnham follows her. The container is blown into space once Discovery is inside the Breen shuttle bay and breaks open (dunno why), fully revealing the transdimensional portal as it falls towards the black holes.
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Kind of a filler episode.... The obligatory 'bad guys get the Macguffin and the good guys have to get it back' episode. Seemed a little silly Discovery got there first, just to have the Breen arrive and immediately tractor it onto their ship. The whole episode could have been avoided if Discovery had just scooped it up as soon as they detected it, rather than standing around talking about it. Rayner even pointed out the Breen could show up at any second, so once again, the Discovery crew comes off looking incompetent just for the plot to happen. Burnham handing over the map in the previous episode, only to find out it is also the key in this episode is also a problem that they just kinda gloss over.
Tilly describes the two black holes as "primordial black holes", and I think it was Burnham that claimed they formed the Milky Way... This is all sorts of incorrect science. If any black holes had a hand in forming the Milky Way, it'd be the supermassive black hole at the center of the galaxy, Sagittarius A*. A primordial black hole is a black hole theoretically formed moments after the Big Bang, and likely have dissipated due to Hawking radiation over billions of years. If any still exist, they'd be relatively small. What they show in this episode likely are stellar black holes.
Apparently they got the science behind the Lagrange Point wrong as well. They had the Progenitor's technology floating between the two black holes, which is a Lagrange Point, but that point has an unstable equilibrium. So an object actually wouldn't stay there indefinitely, at least, not without making periodic adjustments, despite this episode suggesting otherwise.
They said that the casing around the Progenitors' technology is made out of duranium, which made it difficult for their sensors to pick up. A previous episode (the episode with the rain towers) said the tritanium was blocking their transporters. But both of these metals have been established to commonly be used in Starship construction. The hull, bulkheads, the walls of the corridors, literally all over the ships. If they caused the issues this episode suggests, they shouldn't be able to scan inside any starship or transport within them. It comes off like the writers just Googled 'metals in Star Trek' and used the first couple results for their technobabble without bothering to learn the context.
While planning to take the Projenitor's technology from the Breen, we got a nice scene planning it all out with Burnham, Rayner, Book, Tilly, Adira and Stamets. Reminded me of the conference rooms scenes we'd see throughout the rest of Star Trek with the senior staff. It doesn't happen often, if ever, in Discovery. Would have been nice if we had senior staff meetings in this show.
The Breen are disappointing in this episode. They've been reduced to little more than Stormtroopers with Moll bossing them around. They also just sit there once they've tractored the Progenitor's technology into their shuttle bay. Why didn't they go to warp the moment they had it secured knowing the other Breen and Starfleet are probably looking for them now?
Speaking of Star Wars... In order to get into the dreadnaught, they fly a shuttle though an exhaust port in order to get past the shields and beam into the ship. Even though the shields form a bubble around the ship, so they would have had to fly through the shields to even get to said exhaust port....
Couple inappropriately timed discussions during the episode... Tilly asks Rayner to sit in the captain's chair while he's in command because she thinks his pacing is making the crew nervous. As I pointed out with an earlier episode, this is a military style command structure. Who cares if he's pacing rather than sitting in the chair? It isn't any of the crew's place to be questioning him on it. Burnham and Book also take the time to discuss their relationship while undercover on the Breen ship... Really the whole away team seems to be bumbling their way through the mission. It comes off very unprofessionally. Not that it seems to matter with how dumb they made the Breen in this episode.
The transporter lock thing was huge. They had much smaller transporter tags in the 24th century. Seemed like they should have had some 32nd century technology they could have hidden on the case that wouldn't have been so obvious, or could cloak, or something... Once again shows that the creators of this series don't seem to get how advanced they should be.
Speaking of faulty future technology... Book and Burnham disable a Breen guard by pulling out a tube from his helmet. Something the Breen in the 24th century didn't have on their suits. You'd think the Breen of the 32nd century wouldn't have such an obvious weakness.
It was kinda cool to see Discovery's nacelles pulled up over the engineering hull for them to fit the ship into the Breen shuttle bay. An actual practical reason for them to be able to detach. Apparently Discovery has at least 7 torpedo bays, as at one point someone said it had taken damage. For a science vessel, Discovery is extremely well armed....
How exactly did the scientists of the 24th century create this case around a transdimensional portal that they apparently put the Progenitor's technology inside? That seemed a little too advanced for their era.
I didn't get why Discovery let the Progenitor's technology just float away like they did. I mean, it was sorta the plan. But they were supposed to beam it aboard along with the away team. Yet, they beamed the away team up and left the case to keep floating off towards the black holes.
There was also a subplot with Saru in this episode discussing smoothing things over with the other Breen so that Discovery wouldn't have two Breen dreadnaughts to deal with. Good to see the character again but unfortunately it didn't really add anything to the episode.