Can i ask , if another someone have problem with genereting caves in second sulfur world ? I have play this world for some hours, but 0 iron boulders . Only way to get iron ore is from basic digging or iron bar from kegs, if i have luck.
Thank you for answer.

You should find some if you explore enough. Generally they're lower down I've found.

i have play original game, so i know, that iron boulders were even on same basic height, only more on the left/right. I try it. Thanks.

I am in crystal world currently. i found iron boulders were rare there. most of the iron i found was through digging. and rarer cases in barrels. however you have plenty of iron in the ship both raw ores and processed ones. although the processed ones are good for building the bridge.