Eyes of Nine
Everything's Fine
And adding to my own post above, the way you gate it is "Hey you 1st level shlubs. This mission should be ok for you to handle while the 1st, 2nd, 3rd, 4th, 5th .... xth mate are off handling "real" missions. Try not to screw it up, ok?" And of course add places where the party most definitely CAN screw it up - hilarity ensues.