The Pacific Ocean is a problem for ALL tectonic models. Neither Plate Tectonics nor Catastrophic Plate Tectonics has a better answer than Hydroplate Theory. We all struggle when it comes to the Pacific Ocean. The biggest problem for HPT is not knowing the arrangement of land and sea before the Flood, because one of HPT's starting assumptions is that the world didn't start out with Pangea surrounded by a large ocean. PT, CPT, and other Flood models propose massive rearrangement of continents, as if they were pieces of furniture that can be moved around at will, to suit the theorist. In reality, continents don't move easily at all, and magma plumes are not an adequate mechanism for movement. HPT proposes only one window of opportunity for continents to slide-- when the continental plates were resting on an almost friction-free surface of supercritical water. This is the only scenario in which a continental could actually slide.

As time goes on, HPT may well undergo modifications as we learn more about the ocean floor. We know more than we did in the 1960s when PT was theorized, but in the coming decades we will continue to receive more data as exploration continues.

This objection was analyzed by several professional nuclear engineers, and they all agreed that this objection is unwarranted. (The objector did not have a degree in nuclear physics.)  It has been clearly demonstrated by thousands of experiments, at several labs, that when Z-pinch occurs (when high voltages are running through atoms in granite or quartz) and atoms break apart then recombine to form heavier elements (stable or unstable), energy is ABSORBED not released. (They call this "cold repacking.") At worst, the entire process is adiabatic (energy neutral). The majority of fast neutrons created by nuclear processes would have been absorbed by either the supercritical water or by the growing volume of ocean water.  Water is used in nuclear reactors to absorb harmful radiation. It has a huge capacity to absorb energy with producing a large rise in temp. Having said all this, the crust probably did experience some warming during the Flood. We know that parts of it melted into lava. However, the crust was never in danger due nuclear processes.

Another note: Heat energy gained by the supercritical water simply increased the pressure, the velocity, and the number of droplets, all of which then helped to increase the heat removal. As SCW gets hotter and hotter, it breaks into more ions, both positive and negative, which makes electrical potential energy, not thermal energy. After the Flood began, almost all this energy became kinetic energy (because of the properties of SCW). The kinetic energy contributed to the immense force that was able to launch debris into space.

To listen to a more detailed explanation of this, go to: https://kgov.com/heat-5

The radioactivity chapter has 160 end notes citing research articles that support his ideas. By any academic publisher's standards this would be considered adequate support.

This objection has come from both secular and creationist sources. Secular scientists believe that the early earth was molten for millions of years, so water cannot possibly have existed anywhere but on the surface. However, the existence of water itself, even on the surface, is a huge problem for their theories. The current theory is that comets brought water to earth, but they know there are huge problems with this theory. For creationists who believe God created the world, this objection is ridiculous. God was able to make the earth in any way He chose. Water under the crust is not  any harder to believe than God creating the universe from nothing.

Support for the idea of deep water under the crust has come from the world's deepest boreholes, which found hot, salty water with dissolved gases at depths up to 7 miles (deeper than any surface water goes) and the presence of "potential water" locked up in the chemical structure of minerals assumed to be abundant in mantle rock.

Some of the forces that were contributing to the extreme heat and pressure were no longer in operation (such as the nuclear heat produced by the fluttering crust), so only the original temp of the supercritical water was still in play. However, the principle of cooling due to expansion was still operating, and the escaping hot water was being allowed to quickly expand as it exited the chamber. This caused rapid cooling. The water might still have been warm, but not hot enough to boil the oceans or kill ocean life. (To be sure, much ocean life did die, as seen in the fossil record. Perhaps some organisms were indeed killed by hot water, but probably most died for other reasons, perhaps from great amounts of dirt in the water around them, causing asphyxiation; or they were buried alive by great volumes of sediments descending down upon them.)