Teasy Kane was outside of a friendly POS, most likely assigning fighters to one of his ratting alts in system when a cyno went up not far off the POS. In a flash Black Legion. jumped through with 4 titans and almost in synchrony 4 doomsdays hit the Hel, reducing it to a smouldering pile of ash. Drive-by-Doomsdays onto carriers are relatively common but a Drive-by-Doomsday onto a super-carrier? Well that is quite rare indeed.
A video of the Drive-by-Doomsday recorded by one of the titan pilots:
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