Not even Bethesda's servers can survive a triple nuke explosion. A group of players learned that the hard way after they initiated a synchronised triple nuke launch that made the servers crash before they even reached the blast zone.
Launching one nuke in Fallout 76 gets you in a fight with all kinds of radiated monstrosities and also rewards you with a bunch of high-end loot. Launching three, and at the same time gets you a "You have been disconnected from the server" message. Yes, triple nuke strike will obliterate everything and that includes Bethesda's servers.
A group of players who spent most of their closed beta playtime searching and decrypting nuke codes have decided to test their findings in the same spot, at the same time. After the mushroom cloud showed up, players hurried to the blast zone, but instead rare loot and triple head monsters they were welcomed by a menu screen instead. Before the launch, they even joked that servers may crash after the triple explosions.
It's not clear if three detonations were, in fact, cause for server crash since Bethesda's servers crash all the time. Some players have been reporting crashes after just one nuke launch so it's expected that same would follow after three synchronised nuke explosions.
One user on Reddit pointed out that the cause for server crash would probably be in a number of kills in each area after which the game had to spawn a huge number of entities at the same time along with graphical effects for every nuke. This ultimately led to server overload which caused the crash.
Players said their goal was to see what would happen if three Scorchbeast Queens were spawned at the same time. Scorchbeast Queen is a high-level dragon that shows up after the blast. They were curious if the combination of nukes would spawn even higher level monster but they never got to find out.