This article lists all the information about the tunnel connection for the glowing sea. Research is based almost exclusively by TholeusArsia. If you would like to see something which is missing in the text below feel free to post to this article. Thanks.
GeneralAs is, I do appreciate the mod. I've had the original Subway Runner forever and I'm glad you've taken things over.
- Deeper, more wrecked, rubble-filled, toxic vapors, lots of ferals, etc.
- A lot of People run South of the Sea - SotS and AW, both have visible surface assets to the south and east of Atlantic O. However the north side is clear.
Spoiler: 
Image by TholeusArsia
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Subway Line
Ends at a manhole cover in the middle of the road southeast of the Scrap Palace. The line into the Glowing Sea would begin there. The line should be considerably more degraded than other subway lines to the north of the GS and should include very high levels of toxicity such as radiation or gas, especially at the Decayed Reactor Site and approaching/exiting the Crater Breach.
Three different GS subway lines: a civilian line (orange), which is identical to current lines (although more wrecked and dangerous): a military line (yellow) which was used to transport civilian contractors and freight to the Sentinel Site before the war; and an approach line (blue) which was constructed to build the vault/settlement/"city" in secrecy and later to evacuate Sentinel personnel and families to that facility.
Missile impact during the war excavated the GS crater directly on top of the subway line. The line was uncovered and breached, and a portion of it - in the crater - was destroyed. The crater will need to be crossed at that point. Entry into and exit from the breached line can be done through rubble-choked holes on the crater walls on either side. Approaches and entries to the crater breach along the line are manned by COA guards, befitting the COA settlement in the crater.
Subway Station
Surface subway stations at Atlantic Offices and the O'Neill Factory should be located a short distance away. If possible, care should be taken so that the station at Atlantic Offices should not interfere with SOTS or AW assets in that area.
[5] Underground stations at the Decayed Reactor Site and the Sentinel Site can open into those facilities or not, depending on what's possible. If not, collapsed staircases, etc.
Enemies
No raiders, except perhaps at the Atlantic Offices station, where there might be a sealed-in "colony". (How would raiders survive?) Perhaps a big raider scavenging party or two along the line, all decked out in Raider armor. I'd locate the colony at or near Atlantic O or the Parking Station because it's close to the northern boundary of the GS and seems more
believable thereby.
Likewise, CoA patrols. Ferals, scorps, moles, rats, cave crickets, cockroaches, etc., for sure.
I still like the idea of plowing through elite Super Mutant formations to save surviving humans. Maybe a military line beyond the crater vault to the isolated military sanctuary, now located far beneath the Sentinel Site? Under seige by the SM's?
Coursers leading synth squads searching for tech along the line. Escaped synths hiding out along the line, perhaps even a small synth sanctuary. Railroad synth sanctuary house on the GS border near the beginning of the line - trade and sleep. Throwing out suggestions....
Glowing Sea Crater
The underground "city"/settlement/vault is only a suggestion and would involve some work, I know. My idea was it's a military facility built before the war - not a Vault-Tech facility - and that Sentinel personnel, contractors and their families were evacuated to it. Their descendants still survive there. When approached by the player, the facility is under assault by a large "expeditionary force" of Super Mutants that'll have to be taken care of. They're the "bosses" of the GS subway line. Afterward, could be handled as a vault, a trading facility, a settlement, etc.
The crater was not caused by an airburst; the crater walls are too steep and ragged. So we're talking about a penetrating or burrowing delivery profile. Almost any structure near point of impact would be torn open, even a reinforced vault buried deep underground. That's not necessarily a bad thing, however. If you're willing to construct a badly damaged vault with a broken subway line passing near or through - both within the crater - I can see all kinds of interesting possibilities; for example, COA elements scavenging the vault, or creatures not normally associated with vault infestations gaining access. Two notes of some interest: First, the mod Fusion City locates an intact vault with COA inhabitants in the crater. Second, a mod by Spiffy[skytrooper] called "The Lost Vault" created a ruined facility just outside the crater. It was pulled from Nexus a few years ago, but the ambience and design were terrifying.
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On a completely different note, something has been bothering me about the rail lines in relation to the subway lines, I see that before the orange subway line in your original mock up ends at a point of the southern rail line. I just think it odd that the northern rail line lacks a similar subway station. While not as densely populated an area like Cambridge, Boston or Lexington the northern rail could be carrying people on the trains into or out of the region.
Hereis probably the best spot, it is in the north, has access to the road, has rail-line access and is a relatively empty part of the map. Which is a shame because looking at it from a logistics perspective it doesn't make a whole lot of sense for it to be empty.Could easily be a freight-line going to East-Boston or Salem, the regular rail-line only goes to West-Boston so it would make sense for there to be an alternate path for freight to move. As it in not close to any high population areas, I would figure it would be over run with Super Mutants or Ghouls if going to East-Boston. Alternately as a freight line going to Salem it could be occupied by The Forged.
Had to take the picture with my phone. For some reason steam would not take pictures.