We arrived a little late to see the whirlpools at their best, but we were able to easily see the strong currents created by the meeting of the two bodies of water. The floor had glass coverings so visitors could easily see below periodically, but any view of the undertows was blocked by those steel latices. It's a little difficult to see as a result, but we're 45 meters (147 ft) above the ocean, and the undertow created by the two conflicting currents is almost inescapable.