The disadvantage is that there is a lot of equipment, and the number of people required a long time to make a survey of the area is less than the VES. Need a space to explore and survey equipment is expensive.
The downside is that a lot of equipment, requires a lot of people and made a survey of the area less than a VES. Require a lot of space to explore and survey equipment is expensive.
The disadvantage is the equipment,. Use of a lot of people and long time to survey the area less than a VES. Need space survey and surveying equipment is expensive.