Sappeur is a safe and efficient programming language. The memory safety of Sappeur programs is equivalent to Java or .NET without having the performance penalties of those languages. This is implemented with smart pointers and stack allocation of objects and arrays. Also, arrays of objects and synchronous destructors are possible. Sappeur executables are native code and do not use a garbage collector. The safety properties of Sappeur are assured by a proper type system (which forbids weird pointer casts for example) and runtime checks. This is true for both single- and multithreaded programs. The Sappeur compiler translates programs into safe C++ programs, which makes integration with existing C++ code simple. Finally, Sappeur technology erects another layer of defense against cyber threats.