[2021] Bismarck Secondary Build in 0.10.8

If I'm full secondaries on the Bismarck then I will take this build and sometimes rotate between:
T1 - Preventative Maintenance or Pyrotech for extra secondary fires.
T2 - Grease the Gears or Vigilance to help dodge / tank Torps
T4 - I take Manuals / Heal / Fire Res for maximum tankiness
The key, IMO is to be careful not to rush in too early. Better to wait until the map reveals itself a bit, then use islands to get close to an enemy and trap them in secondary range.