Riley Vashtee:  These doors ' trip code is the answer to a random question set by the crew . Nine tours back , we got drunk , thought them up . Reckoning was , if we 're hijacked , we 're the only ones who know all the answers .
Martha Jones: So you type in the right answer ...
Riley Vashtee: This sends a remote pulse to the clamp . But we only get one chance per door . Get it wrong , the whole system freezes .
Martha Jones: Better not get it wrong , then .
Riley Vashtee: Okay . ' Date of the SS Pentalian 's first flight ? ' That 's all right . Go !
Martha Jones: Yes !
Riley Vashtee: _ Twenty eight _ more to go !
Riley Vashtee: '
Riley Vashtee: Find the next number in the sequence : 313 , 331 , 367 ... ? ' What ?
Martha Jones: You said the crew knew all the answers .
Riley Vashtee: The crew 's changed since we set the questions .