A toilet which had been leaking water under the base of the toilet has leaked into the subflooring, and into the crawlspace. While this could be an issue that has been taking place over a long period of time, or a water leak that just transpired, your need to address the water leak, and potential for mold needs to be addressed. One call to SERVPRO and a crew will arrive less than an hour. SERVPRO will perform a Water Mitigation, a complete dry out, and finally a Mold Remediation. Getting you back to "Like it never even happened."