What do these mean here?
1. Does 'saviour' mean 'true success' ?
Proteins, or even, under some circumstances, just the amino-acid building blocks from which they are made, would be greatly suggestive by themselves. Dr McKay hopes that the very ease of bringing back a sample from Enceladus may prove the idea’s saviour.
2. Does 'sneak into' mean 'to come under' ?
The Japanese, like the Americans, have experience with sample-return of this sort, having flown a probe called Hayabusa that retrieved dust from the plume of a comet in 2010. And if the Japanese picked up half the cost, then a trip to Enceladus could just about sneak into NASA’s budget alongside the one to Europa.