snorkel schnorchel HELP!!!!!

still can't get snorkel working (tryind to get to: submerged-snorkel depth w/diesel engine power and battery recharging)

SH3 with GWX 2.0
VII B
ask CE to go to snorkel depth and rise snorkel
ok so far- Javolta

but
crew remains in electric eng compartment- so I manually move them to diesel engines compartment
but still diesels not running- still staying at 0 knots
engineer won't allow me to select "run in recharge mode" -not highlighted
help???