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We present the deepest 850 $\mu$m map of the SSA22 field to date, utilizing acombination of new and archival observations taken with SCUBA-2, mounted at theJames Clerk Maxwell Telescope (JCMT). The mapped area covers an effectiveregion of approximately 0.34 deg$^2$, achieving a boundary sensitivity of 2 mJybeam$^{-1}$, with the deepest central coverage reaching a depth of$\sigma_\text{rms}$ $\sim$ 0.79 mJy beam$^{-1}$, the confusion noise isestimated to be $\sim$ 0.43 mJy beam$^{-1}$. A catalogue of 850 $\mu$m sourcesin the SSA22 field is generated, identifying 390 sources with single-to-noiseratios above 3.5, out of which 92 sources exceed 5$\sigma$. The derivedintrinsic number counts at 850 $\mu$m are found to be in excellent agreementwith published surveys. Interestingly, the SSA22 number counts also exhibit anupturn in the brighter flux region, likely attributed to local emitters orlensing objects within the field. On the scale of $\sim$ 0.3 deg$^2$, the 850$\mu$m number counts are unaffected by cosmic variance and align with the blankfield. In the deep region ($\sigma_\text{rms}$ $\leqslant$ 1 mJy), the countsfor fluxes below 8 mJy are consistent with the blank field, and the excess inthe brighter regime is not significant. Due to the limited number of verybright sources and the insubstantial cosmic variance in our field, we attributethe fluctuations in the number counts primarily to Poisson noise. The SCUBA-2850 $\mu$m detection in the SSA22 field does not exhibit indications ofoverdensity.

Deep Submillimetre and Radio Observations in the SSA22 Field. II. Sub-millimetre source catalogue and number counts