Today, the Multi-Sensor Core Logger lost the "multi" - now there are only two sensors left. More p-wave transducers broke during the day and we had to remove the p-wave/core-thickness deviation arrangement. I learned that the rubber-roll-transducers are only for soft-sediment cores in plastic liners and not for hard-rock cores (these are too abrasive). And that Geotek would readily deliver the correct sensors for 15000 € (+ 5000 € delivery and training) ... ... ... ah, well, we can do without them.