Unlike OBC operations, a node vessel does not connect to a node line, whereas ocean bottom cables need to be physically attached to a recorder vessel to record data in real-time. With nodes, until the nodes are recovered and the data reaped from them (reaping is the industry term used to remove data from a recovered node when it is placed within a computerised system that copies the hard drive data from the node), there is an assumption that the data will be recorded as there is no real-time quality control element to a node's operating status as they are self-contained and not connected to any system once they are deployed. The technology is now well-established and very reliable and once a node and its battery system has passed all of its set up criteria there is a high degree of confidence that a node will work as specified. Technical downtime during node projects, i.e. individual node failures during deployment are usually in single figures as a percentage of the total nodes deployed.