What is survival mode in metal gear online?

Well, I can answer the two questions you asked. First, survival mode is basically you go around and try & kill and not die while you are fighting others. Second, the expansion pack is basically extra stuff on meta gear. It's just more stuff.

survival is where you create or join a team of 6

then you battle other teams at random maps and random rules best of 2 rounds wins

if you lose you get 50 rwds points

if you win you get 100 rwds points

win 2 in a row you get 200 points this adds onto the 100 points from last round

3 in a row you get 300 points which get added on to the previous points

this goes on until 5 wins in a row (1500 rewards points)

this is the best way to get rewards points in mgo

that's why it can only be played on wed. thurs. and fri. between 6 and 10

the expasion packs are packages of maps as well as some exclusive

gear

they also include unique characters

mei ling and liquid ocelot for gene

meryl and akiba for the meme exp.

raiden and vamp for the scene exp.

you can also create female characters