This weekend, the crew of Expedition 63 aboard the ISS will continue investigating a “small leak” on the International Space Station. While the ISS is not airtight and the leak was identified months ago, the leak rate has slightly increased and caused some alarms to trigger.

American and Russian crewmates previously shared one half of the space station in an attempt to track down the leak. The current theory is that the leak is on the Russian half of the ISS, but pinpointing the source of the problem has proved challenging thus far.

After analysis, the leak traced back to the main work area of the Zvezda Service Module, although determining the exact location of the leak will require more work. This leak poses no immediate danger and has been on the radar for the crew and NASA for several weeks and has only resulted in a minor inconvenience to the day-to-day schedule.