in the project, and one of the differences is in the depth they can drill to. Hand Auger The hand auger weighs 80 kg and can be operated by a single operator, and is useful for collecting ice cores with a diameter of 74 mm from the top 10 m of the ice cap. The Shallow Drill The shallow drill can produce cores up to 50 m long and 74mm in diameter per day on 350m top ice that does not require drilling fluid. The Deep Drill The deep drill works in liquid-filled holes and can be operated at any depth. Compared to other drills, the operation is relatively slow, however, it has the advantage of being able to retrieve the core section. How GRIP relates to other ice core projects in Greenland In addition to GRIP, several more ice core projects were held in Greenland such as Greenland Ice Sheet Project (GISP2), North Greenland Ice Core Project (NorthGRIP), and North Greenland Eemian Ice Drilling (NEEM). Greenland Ice Sheet Project (GISP2) First, GISP2, which was done after GRIP, left a result that overturned the result discovered by GRIP. It was initially hypothesized that severe climate change was repeated during the last interglacial period in Greenland, based on the fact that the oxygen isotope ratio fluctuated sharply near the bottom of the GRIP core. However, it was revealed that the isotope of oxygen ratio data of the GISP2 core excavated only 30 km away from the sampling point of the GRIP core does not match the data of the GRIP core deep in the core. It became clear that the ice layer structure was disturbed by folds at the bottom of the ice sheet in both cores, indicating that the interpretation that there was a severe climate change effect during the final interglacial period may be incorrect. The GISP2 reconstructions are relatively old. Recent studies have questioned the hypothesis of changing the relationship between temperature and Delta-O-18 during the Holocene and how best to explain elevation changes in the ice cap at the GISP2 site. The GISP2 reconstructions change the relationship between Delta-O-18 and temperature by a factor of two during the Holocene, while more recent reconstructions remain unchanged. Again, elevation change affects the Delta-O-18 record. Older GISP2 reconstructions do not account for elevation changes. NorthGRIP NorthGRIP aimed to collect ice during the final interglacial period, but the bottom of the