Ahoy railroaders,

this is a very early guide on how to get the five new achievements released with the Underwater Update.

The achievements are ordered chronologically, i.e. in the order you will probably (want to) unlock them if you want to be efficient.

You can get all new achievements in one playthrough. Consider getting "Martian" separately.

The underwater biome can be entered by building tracks into a wooden gate. The entrance is always on top. You can only enter this biome once.

• It can appear in the first three biomes (grass, desert, and snow) only[unrailed-wiki.com].
  
• It can appear beginning from the third section in each biome.
  
• It can appear multiple times in one biome.

The special bolt appears in the third section, i.e. on your way towards the third station, in each biome. You do not have to collect the special bolt.

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Warning: the entrance did not appear for us when using an old savegame.

In the main screen of the game, you may see a gate in the top left. You can even enter it!

There is no shop when underwater! Plan ahead and farm your favorite wagons in the start biome before entering this biome.

In every section, there is one option to exit. It will be near the station and, unlike the entrance, not always at the top.

The area is mostly open (on medium difficulty). Also there is dynamite-like fish. The often spawn in groups of three. A dynamite wagon is good but not essential.

Besides, these fish can be connected to the milk wagon[unrailed-wiki.com] to receive an infinite amount of oxygen.




You can swim across gaps but, unlike in space, you can not float outside.











Funfact: dynamite fish do not float. Instead, they step up and down the edges.

• Your water wagon provides air. Consider upgrading it to increase the radius.
  
• You get one portable air source (your bucket).
  
• Geysers provide air, too.

• you will have the next engine,
  
• therefore be in the next biome,
  
• and have to play until the next station to get into the shop

These fish are explosive - handle with care!

Underwater, you will encounter dynamite-like fish. They expand when a player is near them. At a certain point they explode.

For this achievement, pick one up and let it kill you with its explosion.

You tend to like it underwater!

Play for 30 minutes in the new Underwater biome in one go.

You found the exit.

Simply build tracks back to the exit present in each section. Note that back at the surface you still have to reach the next station!

Discover a new world.

This achievement is not related to the new Underwater biome. Instead, the list of "30 min-in-one-biome"-achievements is completed by adding one for the Mars biome.

Play in the Mars biome for at least 30 minutes in one go. Remember that saving and loading will reset the counter!



















For Mars, an Auto-Collector is really helpful. With blue dynamite, resources will be plenty and you can build vertical loops (one track-wide spacing recommended) to keep the train speed low for as long as possible. Two or three stations should be sufficient.

Getting all those bolts surely took some time!

There is a new special bolt in the underwater biome. It should appear in the third section of the biome[unrailed-wiki.com].





It can be hidden behind rocks. Watch out for it!






Collect it and all other special bolts in each biome in one play through to unlock this achievement. It should pop without the need to upgrade to the bus.