Yes, comprehensive travel and health insurance is mandatory for your trip. Blue Silk DMC includes $200,000 medical evacuation coverage as part of this package, but this MAY not be enough to cover all situations, so it is important that your travel insurance policy provide additional coverage for this.
I will provide you a quote for insurance once you have made made the deposit for your trip. Please note that most travel insurance must be purchased within 14 days of your first deposit to cover pre-existing conditions.