Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
An archaeologist discovered three dig sites from different periods in one area. The archaeologist dated the first dig site as 352 years more recent than the second dig site. The third dig site was dated 3700 years older than the first dig site. The fourth dig site was twice as old as the third dig site. The archaeologist studied the fourth dig site’s relics and gave the site a date of 8400 BC. What year did the archaeologist date the second dig site?

### Response:
 Eneo la kwanza la uchimbaji ni miaka 352 zaidi ya eneo la pili la uchimbaji, hivyo eneo la pili la uchimbaji ni miaka 352 zaidi ya eneo la kwanza la uchimbaji. Eneo la kwanza la uchimbaji ni miaka 3700 zaidi ya eneo la tatu la uchimbaji, hivyo eneo la tatu la uchimbaji ni miaka 3700 + 352 = <<3700+352=4052>>4052 zaidi ya eneo la pili la uchimbaji. Eneo la nne la uchimbaji ni mara mbili ya umri wa eneo la tatu la uchimbaji, hivyo eneo la nne la uchimbaji ni mara mbili ya 4052 = <<2*4052=8104>>8104 zaidi ya eneo la pili la uchimbaji. Mtafiti wa kale alitambua eneo la nne la uchimbaji kuwa tarehe ya 8400 KK, hivyo eneo la tatu la uchimbaji lilipangwa kuwa 8400 / 2 = <<8400/2=4200>>4200 KK. Eneo la tatu la uchimbaji ni miaka 3700 zaidi ya eneo la kwanza la uchimbaji, hivyo eneo la kwanza la uchimbaji lilipangwa kuwa 3700 - 4200 = <<3700-4200=-500>>-500 KK. Eneo la pili la uchimbaji ni miaka 352 zaidi ya eneo la kwanza la uchimbaji, hivyo eneo la pili la uchimbaji lilipangwa kuwa -500 - 352 = <<-500-352=-852>>-852 KK.