This is set in a near-future war where advanced remote technology exists, drones and other automated weapons fight alongside human fighting units. These battles mainly take place in temperate climates, or desert.
Most of the autonomous attack vectors have been air-and land-borne in nature and both sides have developed effective defences.
A recent, deadly innovation is the robo-snake. Its capabilities allow it to bypass traditional defences against land and airborne autonomous weaponry. At this point in the story, these attacks have been very effective against some army units, and an effective defence has not been formulated.
Description: 3ft long and 3 inches in diameter, made of strengthened titanium
- Can travel overland at up to 15mph
- Can burrow underground at speeds of up to 2mph
- "Teeth" are envenomed with liquid VX nerve agent
- Contains 1kg of high explosive
- Can't swim, but can survive and operate under water
- "killing" a robo-snake results in an appreciable chance that they'll explode
- Robo-snakes will self-destruct when their battery level reaches 10%
- Battery life is between 12 and 18 hours
Guidance: Initially overland via GPS, they make their final stealth approach from underground. They have a priority to seek out human "prey" through heat/scent triggers. Once their VX payload has been depleted, they then seek out large electrical sources (they seek men first, and then go for the hardware).
The mission brief for deployment of the robo-snakes is quite simple. They're targeted to a particular geographic location and are able to attack autonomously, usually approaching from underground. They are deployed in large numbers, up to 250 at a time.
Many of these attacks occur on plains.
Given an in-theatre fighting base of 1,000 men and associated habitation/equipment, how can these robo-snakes be defended against?
Assume that the defending army has access/capability for equivalent technology.
I'd prefer to see answers that can lead to an exciting narrative.