I'm afraid not 
1) You'd actually need to move those units (ie, wake them up and hit spacebar)
2) Certain techs (Ast, Nav IIRC) lower this chance.
3) AI's trireme's don't sink anyway

1) You'd actually need to move those units (ie, wake them up and hit spacebar)
2) Certain techs (Ast, Nav IIRC) lower this chance.
3) AI's trireme's don't sink anyway
Comment