This document summarizes MongoDB Atlas Data Lake, a new service that allows customers to access, query, and analyze long-term data stored in AWS S3 buckets. It implements MongoDB's query language and security model to provide a familiar interface for working with structured data in object storage. The service is read-only, distributed, and optimized to handle queries over vast amounts of data efficiently using MongoDB's aggregation engine. Customers maintain full control over their data and how it is configured and accessed.