Apparatuses, systems, and methods for data and/or power transfer to and from an ocean bottom seismic node are described. In an embodiment, an autonomous seismic node is configured with a bulkhead connector assembly that may be coupled to a plug assembly for data and/or power transfer and a pressure cap assembly when utilized subsea. A plurality of pins may be located on the bulkhead assembly in a substantially flat contact surface to obtain an external electrical connection to the node. The pins on the bulkhead assembly may form a flat circuit with an external device, such as a plug assembly or pressure cap assembly. One or more external devices may be coupled to the pressure cap assembly and/or bulkhead connector for increased functionality to the node. A quick release assembly and/or locking ring may be utilized to fasten any external device to the bulkhead connector assembly.