It was the last major exploratory mission in the territory without radio or aerial support.

In the first ten years he led almost every diplomatic or exploratory mission, and took almost all important decisions for the mission.

Exploratory missions do not need to be expensive or complicated.

She has proven to be an able pilot and accompanies many of the exploratory missions.

All resistance circuits contained at least one wireless operator, and all drops or landings were arranged by radio, except for some early exploratory missions sent blind into enemy-occupied territory.