General comments on manuscript

This manuscript highlighted the learnings gained and challenges faced in research conducted on multi-hazards risk assessment and management undertaken in the MYRIAD-EU project. The manuscript was well-written with key points easy to understand and follow. Although the manuscript did not discuss any technical approaches in details, due to the limitation of the imposed length of the manuscript and the number of contributions made throughout the project, highlighted approaches were well-cited and easy to follow if readers wants to find out more details about those approaches.

Specific comments:

The authors highlighted valuable learnings and challenges that are beneficial and insightful for DRM researchers looking to apply their research to create real world impacts in practice. Some highlighted key learnings (scientific) includes:

• DRM-MR approaches needs to be holistic so as to enable understanding of interdependencies across hazards, sectors, governance.
• understanding the dynamics and interactions between hazards in a multi-hazard scenario is challenging and requires use of different methods, such as storylines, machine learning and exploratory data visualisation techniques, to help untangle the complex interactions.
• multi-hazards risk assessment research and solutions need to be flexible based on the sectors and scenarios it is applied to, for example the use of risk metrics will differ based on the impacted sector(s). This is to allow stakeholders to better understand the impacts of multi-hazards.

Some key learnings that extend beyond scientific research but is useful for DRM-MR researchers to consider: 

• no one-size fits all solutions when it comes to DRM, even more so when applied to multi-hazards, due to the dynamic nature of interactions between factors such as environment, between-hazards, vulnerabilities, governance processes and implemented adaptation measures.
• importance of co-development with stakeholders involved as early as the proposal formulation stage, so as to ensure the research outputs stay relevant and integration of knowledge from different parties in the collaboration / consortium.
• importance of building a common understanding in the terms and definitions and that the process of doing so needs to be an evolving process.

The authors also highlighted relevant challenges faced in their MR research journey, pointing towards potential areas for future work in advancing our capabilities and understanding in multi-hazards:

• lack of datasets and scenarios to inform MR-related research and studies.
• limited understanding of multi-hazards and their complexity
• multiple data sources, such as from Earth Observations technologies, should be considered and integrated in applications to increase data quality and availability. The "how-to" remains an open research area.

While the authors have also highlighted some future directions for research, such as development of multi-hazards early warning systems, I would appreciate it even more if the authors were able to provide, from their perspective and experience in multi-hazards research, what is currently missing or challenges that are obstacles to the successful development and adoption of multi-hazards early warning systems in real-world.

Please see the attached pdf for the review.