There was a follow up US GISP2 project that hit bedrock on 1 July 1993 after five years of drilling, while European scientists produced a parallel core in the GRIP project.
There was a follow up US GISP2 project. This follow up US GISP2. Project hit bedrock US GISP2 on 1 July 1993 after five years of drilling. European scientists produced a parallel core in the GRIP project.