Subsea Compression offers a low carbon footprint compared to topside offshore gas installations. Now and into the future we will use energy from an array of sources where gas will continue to play an important part. Producing this with the best available technology in the cleanest possible way should be our priority. Following the success of the Åsgard Subsea Compression Project Aker Solutions are going deeper, further and more compact creating the second generation Subsea Compression Systems. The drive to predict, understand and digitalize already in project phase intensifies as flow rates and pressures increase and installed size decreases. This paper will present how novel digital tools are used to predict complex multiphase / multi physics events crucial to the functionality of the Subsea Compression System. Next generation Hybrid Multiphase Models have been used in cooperation between Aker Solutions and Siemens to predict multiphase liquid distribution and gas/liquid separator performance. The outcome is compared to real environment, high pressure, low surface tension measurements. This forms a validation benchmark showing how what was previously deemed “simulation wise impossible” now has evolved into a trustworthy engineering tool. In the Subsea Compression framework this enables perceived risk to be challenged and cost to be reduced way ahead of the test and integration phase. This drives down size and increases the safe operability envelope of the Subsea Compression System effectively getting more gas out on the market.