In a surprising and possibly unlawful act, five state legislators were denied entry Thursday into a taxpayer-funded migrant detention center deep in the Everglades, raising questions about what will happen behind the razor-wire fences that are being erected surrounding the controversial facility the state has named Alligator Alcatraz.

Armed only with state law and a growing list of humanitarian concerns, state Senators Shevrin Jones and Carlos Guillermo Smith, along with Representatives Anna V. Eskamani, Angie Nixon and Michele Rayner, arrived at the gates of the facility to conduct what they saw as a legally authorized inspection.

What they encountered instead was silence, locked doors and a bureaucratic wall. The state’s shifting justification for not letting them in — first a flat denial, then vague “safety concerns” — only fueled suspicions.