These sounds are made with a synthesiser. My synth is the Modal Argon 8 but I sometimes use PC based software synths.
Synthesisers are great fun.
I call this BDOOM, maybe you will see why.
This is just a test using Argon 8 152 factory patch
This one is called SnowScape and is made with patch 369
I call this one Blundering In, Made with LMMS and Hybrid Synth
This is called Mid Ocean - from a hybrid synth patch of similar name.
I call this LOST. It's made with an Argon 8 patch called Earth with a little tweak.
I really like the base on this.